view src/http/modules/ngx_http_uwsgi_module.c @ 7730:1a719ee45526

Upstream: proxy_ssl_conf_command and friends. Similarly to ssl_conf_command, proxy_ssl_conf_command (grpc_ssl_conf_command, uwsgi_ssl_conf_command) can be used to set arbitrary OpenSSL configuration parameters as long as nginx is compiled with OpenSSL 1.0.2 or later, when connecting to upstream servers with SSL. Full list of available configuration commands can be found in the SSL_CONF_cmd manual page (https://www.openssl.org/docs/man1.1.1/man3/SSL_CONF_cmd.html).
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 22 Oct 2020 18:00:23 +0300
parents bffcc5af1d72
children 7ce28b4cc57e
line wrap: on
line source


/*
 * Copyright (C) Unbit S.a.s. 2009-2010
 * Copyright (C) 2008 Manlio Perillo (manlio.perillo@gmail.com)
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>


typedef struct {
    ngx_array_t                caches;  /* ngx_http_file_cache_t * */
} ngx_http_uwsgi_main_conf_t;


typedef struct {
    ngx_array_t               *flushes;
    ngx_array_t               *lengths;
    ngx_array_t               *values;
    ngx_uint_t                 number;
    ngx_hash_t                 hash;
} ngx_http_uwsgi_params_t;


typedef struct {
    ngx_http_upstream_conf_t   upstream;

    ngx_http_uwsgi_params_t    params;
#if (NGX_HTTP_CACHE)
    ngx_http_uwsgi_params_t    params_cache;
#endif
    ngx_array_t               *params_source;

    ngx_array_t               *uwsgi_lengths;
    ngx_array_t               *uwsgi_values;

#if (NGX_HTTP_CACHE)
    ngx_http_complex_value_t   cache_key;
#endif

    ngx_str_t                  uwsgi_string;

    ngx_uint_t                 modifier1;
    ngx_uint_t                 modifier2;

#if (NGX_HTTP_SSL)
    ngx_uint_t                 ssl;
    ngx_uint_t                 ssl_protocols;
    ngx_str_t                  ssl_ciphers;
    ngx_uint_t                 ssl_verify_depth;
    ngx_str_t                  ssl_trusted_certificate;
    ngx_str_t                  ssl_crl;
    ngx_str_t                  ssl_certificate;
    ngx_str_t                  ssl_certificate_key;
    ngx_array_t               *ssl_passwords;
    ngx_array_t               *ssl_conf_commands;
#endif
} ngx_http_uwsgi_loc_conf_t;


static ngx_int_t ngx_http_uwsgi_eval(ngx_http_request_t *r,
    ngx_http_uwsgi_loc_conf_t *uwcf);
static ngx_int_t ngx_http_uwsgi_create_request(ngx_http_request_t *r);
static ngx_int_t ngx_http_uwsgi_reinit_request(ngx_http_request_t *r);
static ngx_int_t ngx_http_uwsgi_process_status_line(ngx_http_request_t *r);
static ngx_int_t ngx_http_uwsgi_process_header(ngx_http_request_t *r);
static ngx_int_t ngx_http_uwsgi_input_filter_init(void *data);
static void ngx_http_uwsgi_abort_request(ngx_http_request_t *r);
static void ngx_http_uwsgi_finalize_request(ngx_http_request_t *r,
    ngx_int_t rc);

static void *ngx_http_uwsgi_create_main_conf(ngx_conf_t *cf);
static void *ngx_http_uwsgi_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_uwsgi_merge_loc_conf(ngx_conf_t *cf, void *parent,
    void *child);
static ngx_int_t ngx_http_uwsgi_init_params(ngx_conf_t *cf,
    ngx_http_uwsgi_loc_conf_t *conf, ngx_http_uwsgi_params_t *params,
    ngx_keyval_t *default_params);

static char *ngx_http_uwsgi_pass(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);
static char *ngx_http_uwsgi_store(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);

#if (NGX_HTTP_CACHE)
static ngx_int_t ngx_http_uwsgi_create_key(ngx_http_request_t *r);
static char *ngx_http_uwsgi_cache(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);
static char *ngx_http_uwsgi_cache_key(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);
#endif

#if (NGX_HTTP_SSL)
static char *ngx_http_uwsgi_ssl_password_file(ngx_conf_t *cf,
    ngx_command_t *cmd, void *conf);
static char *ngx_http_uwsgi_ssl_conf_command_check(ngx_conf_t *cf, void *post,
    void *data);
static ngx_int_t ngx_http_uwsgi_set_ssl(ngx_conf_t *cf,
    ngx_http_uwsgi_loc_conf_t *uwcf);
#endif


static ngx_conf_num_bounds_t  ngx_http_uwsgi_modifier_bounds = {
    ngx_conf_check_num_bounds, 0, 255
};


static ngx_conf_bitmask_t ngx_http_uwsgi_next_upstream_masks[] = {
    { ngx_string("error"), NGX_HTTP_UPSTREAM_FT_ERROR },
    { ngx_string("timeout"), NGX_HTTP_UPSTREAM_FT_TIMEOUT },
    { ngx_string("invalid_header"), NGX_HTTP_UPSTREAM_FT_INVALID_HEADER },
    { ngx_string("non_idempotent"), NGX_HTTP_UPSTREAM_FT_NON_IDEMPOTENT },
    { ngx_string("http_500"), NGX_HTTP_UPSTREAM_FT_HTTP_500 },
    { ngx_string("http_503"), NGX_HTTP_UPSTREAM_FT_HTTP_503 },
    { ngx_string("http_403"), NGX_HTTP_UPSTREAM_FT_HTTP_403 },
    { ngx_string("http_404"), NGX_HTTP_UPSTREAM_FT_HTTP_404 },
    { ngx_string("http_429"), NGX_HTTP_UPSTREAM_FT_HTTP_429 },
    { ngx_string("updating"), NGX_HTTP_UPSTREAM_FT_UPDATING },
    { ngx_string("off"), NGX_HTTP_UPSTREAM_FT_OFF },
    { ngx_null_string, 0 }
};


#if (NGX_HTTP_SSL)

static ngx_conf_bitmask_t  ngx_http_uwsgi_ssl_protocols[] = {
    { ngx_string("SSLv2"), NGX_SSL_SSLv2 },
    { ngx_string("SSLv3"), NGX_SSL_SSLv3 },
    { ngx_string("TLSv1"), NGX_SSL_TLSv1 },
    { ngx_string("TLSv1.1"), NGX_SSL_TLSv1_1 },
    { ngx_string("TLSv1.2"), NGX_SSL_TLSv1_2 },
    { ngx_string("TLSv1.3"), NGX_SSL_TLSv1_3 },
    { ngx_null_string, 0 }
};

static ngx_conf_post_t  ngx_http_uwsgi_ssl_conf_command_post =
    { ngx_http_uwsgi_ssl_conf_command_check };

#endif


ngx_module_t  ngx_http_uwsgi_module;


static ngx_command_t ngx_http_uwsgi_commands[] = {

    { ngx_string("uwsgi_pass"),
      NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1,
      ngx_http_uwsgi_pass,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("uwsgi_modifier1"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, modifier1),
      &ngx_http_uwsgi_modifier_bounds },

    { ngx_string("uwsgi_modifier2"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, modifier2),
      &ngx_http_uwsgi_modifier_bounds },

    { ngx_string("uwsgi_store"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_http_uwsgi_store,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("uwsgi_store_access"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123,
      ngx_conf_set_access_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.store_access),
      NULL },

    { ngx_string("uwsgi_buffering"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.buffering),
      NULL },

    { ngx_string("uwsgi_request_buffering"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.request_buffering),
      NULL },

    { ngx_string("uwsgi_ignore_client_abort"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.ignore_client_abort),
      NULL },

    { ngx_string("uwsgi_bind"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE12,
      ngx_http_upstream_bind_set_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.local),
      NULL },

    { ngx_string("uwsgi_socket_keepalive"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.socket_keepalive),
      NULL },

    { ngx_string("uwsgi_connect_timeout"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.connect_timeout),
      NULL },

    { ngx_string("uwsgi_send_timeout"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.send_timeout),
      NULL },

    { ngx_string("uwsgi_buffer_size"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.buffer_size),
      NULL },

    { ngx_string("uwsgi_pass_request_headers"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.pass_request_headers),
      NULL },

    { ngx_string("uwsgi_pass_request_body"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.pass_request_body),
      NULL },

    { ngx_string("uwsgi_intercept_errors"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.intercept_errors),
      NULL },

    { ngx_string("uwsgi_read_timeout"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.read_timeout),
      NULL },

    { ngx_string("uwsgi_buffers"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
      ngx_conf_set_bufs_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.bufs),
      NULL },

    { ngx_string("uwsgi_busy_buffers_size"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.busy_buffers_size_conf),
      NULL },

    { ngx_string("uwsgi_force_ranges"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.force_ranges),
      NULL },

    { ngx_string("uwsgi_limit_rate"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.limit_rate),
      NULL },

#if (NGX_HTTP_CACHE)

    { ngx_string("uwsgi_cache"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_http_uwsgi_cache,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("uwsgi_cache_key"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_http_uwsgi_cache_key,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("uwsgi_cache_path"),
      NGX_HTTP_MAIN_CONF|NGX_CONF_2MORE,
      ngx_http_file_cache_set_slot,
      NGX_HTTP_MAIN_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_main_conf_t, caches),
      &ngx_http_uwsgi_module },

    { ngx_string("uwsgi_cache_bypass"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
      ngx_http_set_predicate_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_bypass),
      NULL },

    { ngx_string("uwsgi_no_cache"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
      ngx_http_set_predicate_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.no_cache),
      NULL },

    { ngx_string("uwsgi_cache_valid"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
      ngx_http_file_cache_valid_set_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_valid),
      NULL },

    { ngx_string("uwsgi_cache_min_uses"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_min_uses),
      NULL },

    { ngx_string("uwsgi_cache_max_range_offset"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_off_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_max_range_offset),
      NULL },

    { ngx_string("uwsgi_cache_use_stale"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
      ngx_conf_set_bitmask_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_use_stale),
      &ngx_http_uwsgi_next_upstream_masks },

    { ngx_string("uwsgi_cache_methods"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
      ngx_conf_set_bitmask_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_methods),
      &ngx_http_upstream_cache_method_mask },

    { ngx_string("uwsgi_cache_lock"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_lock),
      NULL },

    { ngx_string("uwsgi_cache_lock_timeout"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_lock_timeout),
      NULL },

    { ngx_string("uwsgi_cache_lock_age"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_lock_age),
      NULL },

    { ngx_string("uwsgi_cache_revalidate"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_revalidate),
      NULL },

    { ngx_string("uwsgi_cache_background_update"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.cache_background_update),
      NULL },

#endif

    { ngx_string("uwsgi_temp_path"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1234,
      ngx_conf_set_path_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.temp_path),
      NULL },

    { ngx_string("uwsgi_max_temp_file_size"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.max_temp_file_size_conf),
      NULL },

    { ngx_string("uwsgi_temp_file_write_size"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.temp_file_write_size_conf),
      NULL },

    { ngx_string("uwsgi_next_upstream"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
      ngx_conf_set_bitmask_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.next_upstream),
      &ngx_http_uwsgi_next_upstream_masks },

    { ngx_string("uwsgi_next_upstream_tries"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.next_upstream_tries),
      NULL },

    { ngx_string("uwsgi_next_upstream_timeout"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.next_upstream_timeout),
      NULL },

    { ngx_string("uwsgi_param"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE23,
      ngx_http_upstream_param_set_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, params_source),
      NULL },

    { ngx_string("uwsgi_string"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_str_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, uwsgi_string),
      NULL },

    { ngx_string("uwsgi_pass_header"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_str_array_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.pass_headers),
      NULL },

    { ngx_string("uwsgi_hide_header"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_str_array_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.hide_headers),
      NULL },

    { ngx_string("uwsgi_ignore_headers"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
      ngx_conf_set_bitmask_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.ignore_headers),
      &ngx_http_upstream_ignore_headers_masks },

#if (NGX_HTTP_SSL)

    { ngx_string("uwsgi_ssl_session_reuse"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.ssl_session_reuse),
      NULL },

    { ngx_string("uwsgi_ssl_protocols"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
      ngx_conf_set_bitmask_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, ssl_protocols),
      &ngx_http_uwsgi_ssl_protocols },

    { ngx_string("uwsgi_ssl_ciphers"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_str_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, ssl_ciphers),
      NULL },

    { ngx_string("uwsgi_ssl_name"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_http_set_complex_value_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.ssl_name),
      NULL },

    { ngx_string("uwsgi_ssl_server_name"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.ssl_server_name),
      NULL },

    { ngx_string("uwsgi_ssl_verify"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, upstream.ssl_verify),
      NULL },

    { ngx_string("uwsgi_ssl_verify_depth"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, ssl_verify_depth),
      NULL },

    { ngx_string("uwsgi_ssl_trusted_certificate"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_str_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, ssl_trusted_certificate),
      NULL },

    { ngx_string("uwsgi_ssl_crl"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_str_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, ssl_crl),
      NULL },

    { ngx_string("uwsgi_ssl_certificate"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_str_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, ssl_certificate),
      NULL },

    { ngx_string("uwsgi_ssl_certificate_key"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_str_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, ssl_certificate_key),
      NULL },

    { ngx_string("uwsgi_ssl_password_file"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_http_uwsgi_ssl_password_file,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("uwsgi_ssl_conf_command"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
      ngx_conf_set_keyval_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_uwsgi_loc_conf_t, ssl_conf_commands),
      &ngx_http_uwsgi_ssl_conf_command_post },

#endif

      ngx_null_command
};


static ngx_http_module_t ngx_http_uwsgi_module_ctx = {
    NULL,                                  /* preconfiguration */
    NULL,                                  /* postconfiguration */

    ngx_http_uwsgi_create_main_conf,       /* create main configuration */
    NULL,                                  /* init main configuration */

    NULL,                                  /* create server configuration */
    NULL,                                  /* merge server configuration */

    ngx_http_uwsgi_create_loc_conf,        /* create location configuration */
    ngx_http_uwsgi_merge_loc_conf          /* merge location configuration */
};


ngx_module_t ngx_http_uwsgi_module = {
    NGX_MODULE_V1,
    &ngx_http_uwsgi_module_ctx,            /* module context */
    ngx_http_uwsgi_commands,               /* module directives */
    NGX_HTTP_MODULE,                       /* module type */
    NULL,                                  /* init master */
    NULL,                                  /* init module */
    NULL,                                  /* init process */
    NULL,                                  /* init thread */
    NULL,                                  /* exit thread */
    NULL,                                  /* exit process */
    NULL,                                  /* exit master */
    NGX_MODULE_V1_PADDING
};


static ngx_str_t ngx_http_uwsgi_hide_headers[] = {
    ngx_string("X-Accel-Expires"),
    ngx_string("X-Accel-Redirect"),
    ngx_string("X-Accel-Limit-Rate"),
    ngx_string("X-Accel-Buffering"),
    ngx_string("X-Accel-Charset"),
    ngx_null_string
};


#if (NGX_HTTP_CACHE)

static ngx_keyval_t  ngx_http_uwsgi_cache_headers[] = {
    { ngx_string("HTTP_IF_MODIFIED_SINCE"),
      ngx_string("$upstream_cache_last_modified") },
    { ngx_string("HTTP_IF_UNMODIFIED_SINCE"), ngx_string("") },
    { ngx_string("HTTP_IF_NONE_MATCH"), ngx_string("$upstream_cache_etag") },
    { ngx_string("HTTP_IF_MATCH"), ngx_string("") },
    { ngx_string("HTTP_RANGE"), ngx_string("") },
    { ngx_string("HTTP_IF_RANGE"), ngx_string("") },
    { ngx_null_string, ngx_null_string }
};

#endif


static ngx_path_init_t ngx_http_uwsgi_temp_path = {
    ngx_string(NGX_HTTP_UWSGI_TEMP_PATH), { 1, 2, 0 }
};


static ngx_int_t
ngx_http_uwsgi_handler(ngx_http_request_t *r)
{
    ngx_int_t                    rc;
    ngx_http_status_t           *status;
    ngx_http_upstream_t         *u;
    ngx_http_uwsgi_loc_conf_t   *uwcf;
#if (NGX_HTTP_CACHE)
    ngx_http_uwsgi_main_conf_t  *uwmcf;
#endif

    if (ngx_http_upstream_create(r) != NGX_OK) {
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    status = ngx_pcalloc(r->pool, sizeof(ngx_http_status_t));
    if (status == NULL) {
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    ngx_http_set_ctx(r, status, ngx_http_uwsgi_module);

    uwcf = ngx_http_get_module_loc_conf(r, ngx_http_uwsgi_module);

    u = r->upstream;

    if (uwcf->uwsgi_lengths == NULL) {

#if (NGX_HTTP_SSL)
        u->ssl = (uwcf->upstream.ssl != NULL);

        if (u->ssl) {
            ngx_str_set(&u->schema, "suwsgi://");

        } else {
            ngx_str_set(&u->schema, "uwsgi://");
        }
#else
        ngx_str_set(&u->schema, "uwsgi://");
#endif

    } else {
        if (ngx_http_uwsgi_eval(r, uwcf) != NGX_OK) {
            return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }
    }

    u->output.tag = (ngx_buf_tag_t) &ngx_http_uwsgi_module;

    u->conf = &uwcf->upstream;

#if (NGX_HTTP_CACHE)
    uwmcf = ngx_http_get_module_main_conf(r, ngx_http_uwsgi_module);

    u->caches = &uwmcf->caches;
    u->create_key = ngx_http_uwsgi_create_key;
#endif

    u->create_request = ngx_http_uwsgi_create_request;
    u->reinit_request = ngx_http_uwsgi_reinit_request;
    u->process_header = ngx_http_uwsgi_process_status_line;
    u->abort_request = ngx_http_uwsgi_abort_request;
    u->finalize_request = ngx_http_uwsgi_finalize_request;
    r->state = 0;

    u->buffering = uwcf->upstream.buffering;

    u->pipe = ngx_pcalloc(r->pool, sizeof(ngx_event_pipe_t));
    if (u->pipe == NULL) {
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    u->pipe->input_filter = ngx_event_pipe_copy_input_filter;
    u->pipe->input_ctx = r;

    u->input_filter_init = ngx_http_uwsgi_input_filter_init;
    u->input_filter = ngx_http_upstream_non_buffered_filter;
    u->input_filter_ctx = r;

    if (!uwcf->upstream.request_buffering
        && uwcf->upstream.pass_request_body
        && !r->headers_in.chunked)
    {
        r->request_body_no_buffering = 1;
    }

    rc = ngx_http_read_client_request_body(r, ngx_http_upstream_init);

    if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
        return rc;
    }

    return NGX_DONE;
}


static ngx_int_t
ngx_http_uwsgi_eval(ngx_http_request_t *r, ngx_http_uwsgi_loc_conf_t * uwcf)
{
    size_t                add;
    ngx_url_t             url;
    ngx_http_upstream_t  *u;

    ngx_memzero(&url, sizeof(ngx_url_t));

    if (ngx_http_script_run(r, &url.url, uwcf->uwsgi_lengths->elts, 0,
                            uwcf->uwsgi_values->elts)
        == NULL)
    {
        return NGX_ERROR;
    }

    if (url.url.len > 8
        && ngx_strncasecmp(url.url.data, (u_char *) "uwsgi://", 8) == 0)
    {
        add = 8;

    } else if (url.url.len > 9
               && ngx_strncasecmp(url.url.data, (u_char *) "suwsgi://", 9) == 0)
    {

#if (NGX_HTTP_SSL)
        add = 9;
        r->upstream->ssl = 1;
#else
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "suwsgi protocol requires SSL support");
        return NGX_ERROR;
#endif

    } else {
        add = 0;
    }

    u = r->upstream;

    if (add) {
        u->schema.len = add;
        u->schema.data = url.url.data;

        url.url.data += add;
        url.url.len -= add;

    } else {
        ngx_str_set(&u->schema, "uwsgi://");
    }

    url.no_resolve = 1;

    if (ngx_parse_url(r->pool, &url) != NGX_OK) {
        if (url.err) {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                          "%s in upstream \"%V\"", url.err, &url.url);
        }

        return NGX_ERROR;
    }

    u->resolved = ngx_pcalloc(r->pool, sizeof(ngx_http_upstream_resolved_t));
    if (u->resolved == NULL) {
        return NGX_ERROR;
    }

    if (url.addrs) {
        u->resolved->sockaddr = url.addrs[0].sockaddr;
        u->resolved->socklen = url.addrs[0].socklen;
        u->resolved->name = url.addrs[0].name;
        u->resolved->naddrs = 1;
    }

    u->resolved->host = url.host;
    u->resolved->port = url.port;
    u->resolved->no_port = url.no_port;

    return NGX_OK;
}


#if (NGX_HTTP_CACHE)

static ngx_int_t
ngx_http_uwsgi_create_key(ngx_http_request_t *r)
{
    ngx_str_t                  *key;
    ngx_http_uwsgi_loc_conf_t  *uwcf;

    key = ngx_array_push(&r->cache->keys);
    if (key == NULL) {
        return NGX_ERROR;
    }

    uwcf = ngx_http_get_module_loc_conf(r, ngx_http_uwsgi_module);

    if (ngx_http_complex_value(r, &uwcf->cache_key, key) != NGX_OK) {
        return NGX_ERROR;
    }

    return NGX_OK;
}

#endif


static ngx_int_t
ngx_http_uwsgi_create_request(ngx_http_request_t *r)
{
    u_char                        ch, *lowcase_key;
    size_t                        key_len, val_len, len, allocated;
    ngx_uint_t                    i, n, hash, skip_empty, header_params;
    ngx_buf_t                    *b;
    ngx_chain_t                  *cl, *body;
    ngx_list_part_t              *part;
    ngx_table_elt_t              *header, **ignored;
    ngx_http_uwsgi_params_t      *params;
    ngx_http_script_code_pt       code;
    ngx_http_script_engine_t      e, le;
    ngx_http_uwsgi_loc_conf_t    *uwcf;
    ngx_http_script_len_code_pt   lcode;

    len = 0;
    header_params = 0;
    ignored = NULL;

    uwcf = ngx_http_get_module_loc_conf(r, ngx_http_uwsgi_module);

#if (NGX_HTTP_CACHE)
    params = r->upstream->cacheable ? &uwcf->params_cache : &uwcf->params;
#else
    params = &uwcf->params;
#endif

    if (params->lengths) {
        ngx_memzero(&le, sizeof(ngx_http_script_engine_t));

        ngx_http_script_flush_no_cacheable_variables(r, params->flushes);
        le.flushed = 1;

        le.ip = params->lengths->elts;
        le.request = r;

        while (*(uintptr_t *) le.ip) {

            lcode = *(ngx_http_script_len_code_pt *) le.ip;
            key_len = lcode(&le);

            lcode = *(ngx_http_script_len_code_pt *) le.ip;
            skip_empty = lcode(&le);

            for (val_len = 0; *(uintptr_t *) le.ip; val_len += lcode(&le)) {
                lcode = *(ngx_http_script_len_code_pt *) le.ip;
            }
            le.ip += sizeof(uintptr_t);

            if (skip_empty && val_len == 0) {
                continue;
            }

            len += 2 + key_len + 2 + val_len;
        }
    }

    if (uwcf->upstream.pass_request_headers) {

        allocated = 0;
        lowcase_key = NULL;

        if (params->number) {
            n = 0;
            part = &r->headers_in.headers.part;

            while (part) {
                n += part->nelts;
                part = part->next;
            }

            ignored = ngx_palloc(r->pool, n * sizeof(void *));
            if (ignored == NULL) {
                return NGX_ERROR;
            }
        }

        part = &r->headers_in.headers.part;
        header = part->elts;

        for (i = 0; /* void */ ; i++) {

            if (i >= part->nelts) {
                if (part->next == NULL) {
                    break;
                }

                part = part->next;
                header = part->elts;
                i = 0;
            }

            if (params->number) {
                if (allocated < header[i].key.len) {
                    allocated = header[i].key.len + 16;
                    lowcase_key = ngx_pnalloc(r->pool, allocated);
                    if (lowcase_key == NULL) {
                        return NGX_ERROR;
                    }
                }

                hash = 0;

                for (n = 0; n < header[i].key.len; n++) {
                    ch = header[i].key.data[n];

                    if (ch >= 'A' && ch <= 'Z') {
                        ch |= 0x20;

                    } else if (ch == '-') {
                        ch = '_';
                    }

                    hash = ngx_hash(hash, ch);
                    lowcase_key[n] = ch;
                }

                if (ngx_hash_find(&params->hash, hash, lowcase_key, n)) {
                    ignored[header_params++] = &header[i];
                    continue;
                }
            }

            len += 2 + sizeof("HTTP_") - 1 + header[i].key.len
                 + 2 + header[i].value.len;
        }
    }

    len += uwcf->uwsgi_string.len;

#if 0
    /* allow custom uwsgi packet */
    if (len > 0 && len < 2) {
        ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
                      "uwsgi request is too little: %uz", len);
        return NGX_ERROR;
    }
#endif

    if (len > 65535) {
        ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
                      "uwsgi request is too big: %uz", len);
        return NGX_ERROR;
    }

    b = ngx_create_temp_buf(r->pool, len + 4);
    if (b == NULL) {
        return NGX_ERROR;
    }

    cl = ngx_alloc_chain_link(r->pool);
    if (cl == NULL) {
        return NGX_ERROR;
    }

    cl->buf = b;

    *b->last++ = (u_char) uwcf->modifier1;
    *b->last++ = (u_char) (len & 0xff);
    *b->last++ = (u_char) ((len >> 8) & 0xff);
    *b->last++ = (u_char) uwcf->modifier2;

    if (params->lengths) {
        ngx_memzero(&e, sizeof(ngx_http_script_engine_t));

        e.ip = params->values->elts;
        e.pos = b->last;
        e.request = r;
        e.flushed = 1;

        le.ip = params->lengths->elts;

        while (*(uintptr_t *) le.ip) {

            lcode = *(ngx_http_script_len_code_pt *) le.ip;
            key_len = (u_char) lcode(&le);

            lcode = *(ngx_http_script_len_code_pt *) le.ip;
            skip_empty = lcode(&le);

            for (val_len = 0; *(uintptr_t *) le.ip; val_len += lcode(&le)) {
                lcode = *(ngx_http_script_len_code_pt *) le.ip;
            }
            le.ip += sizeof(uintptr_t);

            if (skip_empty && val_len == 0) {
                e.skip = 1;

                while (*(uintptr_t *) e.ip) {
                    code = *(ngx_http_script_code_pt *) e.ip;
                    code((ngx_http_script_engine_t *) &e);
                }
                e.ip += sizeof(uintptr_t);

                e.skip = 0;

                continue;
            }

            *e.pos++ = (u_char) (key_len & 0xff);
            *e.pos++ = (u_char) ((key_len >> 8) & 0xff);

            code = *(ngx_http_script_code_pt *) e.ip;
            code((ngx_http_script_engine_t *) &e);

            *e.pos++ = (u_char) (val_len & 0xff);
            *e.pos++ = (u_char) ((val_len >> 8) & 0xff);

            while (*(uintptr_t *) e.ip) {
                code = *(ngx_http_script_code_pt *) e.ip;
                code((ngx_http_script_engine_t *) &e);
            }

            e.ip += sizeof(uintptr_t);

            ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                           "uwsgi param: \"%*s: %*s\"",
                           key_len, e.pos - (key_len + 2 + val_len),
                           val_len, e.pos - val_len);
        }

        b->last = e.pos;
    }

    if (uwcf->upstream.pass_request_headers) {

        part = &r->headers_in.headers.part;
        header = part->elts;

        for (i = 0; /* void */ ; i++) {

            if (i >= part->nelts) {
                if (part->next == NULL) {
                    break;
                }

                part = part->next;
                header = part->elts;
                i = 0;
            }

            for (n = 0; n < header_params; n++) {
                if (&header[i] == ignored[n]) {
                    goto next;
                }
            }

            key_len = sizeof("HTTP_") - 1 + header[i].key.len;
            *b->last++ = (u_char) (key_len & 0xff);
            *b->last++ = (u_char) ((key_len >> 8) & 0xff);

            b->last = ngx_cpymem(b->last, "HTTP_", sizeof("HTTP_") - 1);
            for (n = 0; n < header[i].key.len; n++) {
                ch = header[i].key.data[n];

                if (ch >= 'a' && ch <= 'z') {
                    ch &= ~0x20;

                } else if (ch == '-') {
                    ch = '_';
                }

                *b->last++ = ch;
            }

            val_len = header[i].value.len;
            *b->last++ = (u_char) (val_len & 0xff);
            *b->last++ = (u_char) ((val_len >> 8) & 0xff);
            b->last = ngx_copy(b->last, header[i].value.data, val_len);

            ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                           "uwsgi param: \"%*s: %*s\"",
                           key_len, b->last - (key_len + 2 + val_len),
                           val_len, b->last - val_len);
        next:

            continue;
        }
    }

    b->last = ngx_copy(b->last, uwcf->uwsgi_string.data,
                       uwcf->uwsgi_string.len);

    if (r->request_body_no_buffering) {
        r->upstream->request_bufs = cl;

    } else if (uwcf->upstream.pass_request_body) {
        body = r->upstream->request_bufs;
        r->upstream->request_bufs = cl;

        while (body) {
            b = ngx_alloc_buf(r->pool);
            if (b == NULL) {
                return NGX_ERROR;
            }

            ngx_memcpy(b, body->buf, sizeof(ngx_buf_t));

            cl->next = ngx_alloc_chain_link(r->pool);
            if (cl->next == NULL) {
                return NGX_ERROR;
            }

            cl = cl->next;
            cl->buf = b;

            body = body->next;
        }

    } else {
        r->upstream->request_bufs = cl;
    }

    b->flush = 1;
    cl->next = NULL;

    return NGX_OK;
}


static ngx_int_t
ngx_http_uwsgi_reinit_request(ngx_http_request_t *r)
{
    ngx_http_status_t  *status;

    status = ngx_http_get_module_ctx(r, ngx_http_uwsgi_module);

    if (status == NULL) {
        return NGX_OK;
    }

    status->code = 0;
    status->count = 0;
    status->start = NULL;
    status->end = NULL;

    r->upstream->process_header = ngx_http_uwsgi_process_status_line;
    r->state = 0;

    return NGX_OK;
}


static ngx_int_t
ngx_http_uwsgi_process_status_line(ngx_http_request_t *r)
{
    size_t                 len;
    ngx_int_t              rc;
    ngx_http_status_t     *status;
    ngx_http_upstream_t   *u;

    status = ngx_http_get_module_ctx(r, ngx_http_uwsgi_module);

    if (status == NULL) {
        return NGX_ERROR;
    }

    u = r->upstream;

    rc = ngx_http_parse_status_line(r, &u->buffer, status);

    if (rc == NGX_AGAIN) {
        return rc;
    }

    if (rc == NGX_ERROR) {
        u->process_header = ngx_http_uwsgi_process_header;
        return ngx_http_uwsgi_process_header(r);
    }

    if (u->state && u->state->status == 0) {
        u->state->status = status->code;
    }

    u->headers_in.status_n = status->code;

    len = status->end - status->start;
    u->headers_in.status_line.len = len;

    u->headers_in.status_line.data = ngx_pnalloc(r->pool, len);
    if (u->headers_in.status_line.data == NULL) {
        return NGX_ERROR;
    }

    ngx_memcpy(u->headers_in.status_line.data, status->start, len);

    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http uwsgi status %ui \"%V\"",
                   u->headers_in.status_n, &u->headers_in.status_line);

    u->process_header = ngx_http_uwsgi_process_header;

    return ngx_http_uwsgi_process_header(r);
}


static ngx_int_t
ngx_http_uwsgi_process_header(ngx_http_request_t *r)
{
    ngx_str_t                      *status_line;
    ngx_int_t                       rc, status;
    ngx_table_elt_t                *h;
    ngx_http_upstream_t            *u;
    ngx_http_upstream_header_t     *hh;
    ngx_http_upstream_main_conf_t  *umcf;

    umcf = ngx_http_get_module_main_conf(r, ngx_http_upstream_module);

    for ( ;; ) {

        rc = ngx_http_parse_header_line(r, &r->upstream->buffer, 1);

        if (rc == NGX_OK) {

            /* a header line has been parsed successfully */

            h = ngx_list_push(&r->upstream->headers_in.headers);
            if (h == NULL) {
                return NGX_ERROR;
            }

            h->hash = r->header_hash;

            h->key.len = r->header_name_end - r->header_name_start;
            h->value.len = r->header_end - r->header_start;

            h->key.data = ngx_pnalloc(r->pool,
                                      h->key.len + 1 + h->value.len + 1
                                      + h->key.len);
            if (h->key.data == NULL) {
                h->hash = 0;
                return NGX_ERROR;
            }

            h->value.data = h->key.data + h->key.len + 1;
            h->lowcase_key = h->key.data + h->key.len + 1 + h->value.len + 1;

            ngx_memcpy(h->key.data, r->header_name_start, h->key.len);
            h->key.data[h->key.len] = '\0';
            ngx_memcpy(h->value.data, r->header_start, h->value.len);
            h->value.data[h->value.len] = '\0';

            if (h->key.len == r->lowcase_index) {
                ngx_memcpy(h->lowcase_key, r->lowcase_header, h->key.len);

            } else {
                ngx_strlow(h->lowcase_key, h->key.data, h->key.len);
            }

            hh = ngx_hash_find(&umcf->headers_in_hash, h->hash,
                               h->lowcase_key, h->key.len);

            if (hh && hh->handler(r, h, hh->offset) != NGX_OK) {
                return NGX_ERROR;
            }

            ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                           "http uwsgi header: \"%V: %V\"", &h->key, &h->value);

            continue;
        }

        if (rc == NGX_HTTP_PARSE_HEADER_DONE) {

            /* a whole header has been parsed successfully */

            ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                           "http uwsgi header done");

            u = r->upstream;

            if (u->headers_in.status_n) {
                goto done;
            }

            if (u->headers_in.status) {
                status_line = &u->headers_in.status->value;

                status = ngx_atoi(status_line->data, 3);
                if (status == NGX_ERROR) {
                    ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                                  "upstream sent invalid status \"%V\"",
                                  status_line);
                    return NGX_HTTP_UPSTREAM_INVALID_HEADER;
                }

                u->headers_in.status_n = status;
                u->headers_in.status_line = *status_line;

            } else if (u->headers_in.location) {
                u->headers_in.status_n = 302;
                ngx_str_set(&u->headers_in.status_line,
                            "302 Moved Temporarily");

            } else {
                u->headers_in.status_n = 200;
                ngx_str_set(&u->headers_in.status_line, "200 OK");
            }

            if (u->state && u->state->status == 0) {
                u->state->status = u->headers_in.status_n;
            }

        done:

            if (u->headers_in.status_n == NGX_HTTP_SWITCHING_PROTOCOLS
                && r->headers_in.upgrade)
            {
                u->upgrade = 1;
            }

            return NGX_OK;
        }

        if (rc == NGX_AGAIN) {
            return NGX_AGAIN;
        }

        /* there was error while a header line parsing */

        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "upstream sent invalid header");

        return NGX_HTTP_UPSTREAM_INVALID_HEADER;
    }
}


static ngx_int_t
ngx_http_uwsgi_input_filter_init(void *data)
{
    ngx_http_request_t   *r = data;
    ngx_http_upstream_t  *u;

    u = r->upstream;

    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http uwsgi filter init s:%ui l:%O",
                   u->headers_in.status_n, u->headers_in.content_length_n);

    if (u->headers_in.status_n == NGX_HTTP_NO_CONTENT
        || u->headers_in.status_n == NGX_HTTP_NOT_MODIFIED)
    {
        u->pipe->length = 0;
        u->length = 0;

    } else if (r->method == NGX_HTTP_HEAD) {
        u->pipe->length = -1;
        u->length = -1;

    } else {
        u->pipe->length = u->headers_in.content_length_n;
        u->length = u->headers_in.content_length_n;
    }

    return NGX_OK;
}


static void
ngx_http_uwsgi_abort_request(ngx_http_request_t *r)
{
    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "abort http uwsgi request");

    return;
}


static void
ngx_http_uwsgi_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
{
    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "finalize http uwsgi request");

    return;
}


static void *
ngx_http_uwsgi_create_main_conf(ngx_conf_t *cf)
{
    ngx_http_uwsgi_main_conf_t  *conf;

    conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_uwsgi_main_conf_t));
    if (conf == NULL) {
        return NULL;
    }

#if (NGX_HTTP_CACHE)
    if (ngx_array_init(&conf->caches, cf->pool, 4,
                       sizeof(ngx_http_file_cache_t *))
        != NGX_OK)
    {
        return NULL;
    }
#endif

    return conf;
}


static void *
ngx_http_uwsgi_create_loc_conf(ngx_conf_t *cf)
{
    ngx_http_uwsgi_loc_conf_t  *conf;

    conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_uwsgi_loc_conf_t));
    if (conf == NULL) {
        return NULL;
    }

    conf->modifier1 = NGX_CONF_UNSET_UINT;
    conf->modifier2 = NGX_CONF_UNSET_UINT;

    conf->upstream.store = NGX_CONF_UNSET;
    conf->upstream.store_access = NGX_CONF_UNSET_UINT;
    conf->upstream.next_upstream_tries = NGX_CONF_UNSET_UINT;
    conf->upstream.buffering = NGX_CONF_UNSET;
    conf->upstream.request_buffering = NGX_CONF_UNSET;
    conf->upstream.ignore_client_abort = NGX_CONF_UNSET;
    conf->upstream.force_ranges = NGX_CONF_UNSET;

    conf->upstream.local = NGX_CONF_UNSET_PTR;
    conf->upstream.socket_keepalive = NGX_CONF_UNSET;

    conf->upstream.connect_timeout = NGX_CONF_UNSET_MSEC;
    conf->upstream.send_timeout = NGX_CONF_UNSET_MSEC;
    conf->upstream.read_timeout = NGX_CONF_UNSET_MSEC;
    conf->upstream.next_upstream_timeout = NGX_CONF_UNSET_MSEC;

    conf->upstream.send_lowat = NGX_CONF_UNSET_SIZE;
    conf->upstream.buffer_size = NGX_CONF_UNSET_SIZE;
    conf->upstream.limit_rate = NGX_CONF_UNSET_SIZE;

    conf->upstream.busy_buffers_size_conf = NGX_CONF_UNSET_SIZE;
    conf->upstream.max_temp_file_size_conf = NGX_CONF_UNSET_SIZE;
    conf->upstream.temp_file_write_size_conf = NGX_CONF_UNSET_SIZE;

    conf->upstream.pass_request_headers = NGX_CONF_UNSET;
    conf->upstream.pass_request_body = NGX_CONF_UNSET;

#if (NGX_HTTP_CACHE)
    conf->upstream.cache = NGX_CONF_UNSET;
    conf->upstream.cache_min_uses = NGX_CONF_UNSET_UINT;
    conf->upstream.cache_max_range_offset = NGX_CONF_UNSET;
    conf->upstream.cache_bypass = NGX_CONF_UNSET_PTR;
    conf->upstream.no_cache = NGX_CONF_UNSET_PTR;
    conf->upstream.cache_valid = NGX_CONF_UNSET_PTR;
    conf->upstream.cache_lock = NGX_CONF_UNSET;
    conf->upstream.cache_lock_timeout = NGX_CONF_UNSET_MSEC;
    conf->upstream.cache_lock_age = NGX_CONF_UNSET_MSEC;
    conf->upstream.cache_revalidate = NGX_CONF_UNSET;
    conf->upstream.cache_background_update = NGX_CONF_UNSET;
#endif

    conf->upstream.hide_headers = NGX_CONF_UNSET_PTR;
    conf->upstream.pass_headers = NGX_CONF_UNSET_PTR;

    conf->upstream.intercept_errors = NGX_CONF_UNSET;

#if (NGX_HTTP_SSL)
    conf->upstream.ssl_session_reuse = NGX_CONF_UNSET;
    conf->upstream.ssl_server_name = NGX_CONF_UNSET;
    conf->upstream.ssl_verify = NGX_CONF_UNSET;
    conf->ssl_verify_depth = NGX_CONF_UNSET_UINT;
    conf->ssl_passwords = NGX_CONF_UNSET_PTR;
    conf->ssl_conf_commands = NGX_CONF_UNSET_PTR;
#endif

    /* "uwsgi_cyclic_temp_file" is disabled */
    conf->upstream.cyclic_temp_file = 0;

    conf->upstream.change_buffering = 1;

    ngx_str_set(&conf->upstream.module, "uwsgi");

    return conf;
}


static char *
ngx_http_uwsgi_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
    ngx_http_uwsgi_loc_conf_t *prev = parent;
    ngx_http_uwsgi_loc_conf_t *conf = child;

    size_t                        size;
    ngx_int_t                     rc;
    ngx_hash_init_t               hash;
    ngx_http_core_loc_conf_t     *clcf;

#if (NGX_HTTP_CACHE)

    if (conf->upstream.store > 0) {
        conf->upstream.cache = 0;
    }

    if (conf->upstream.cache > 0) {
        conf->upstream.store = 0;
    }

#endif

    if (conf->upstream.store == NGX_CONF_UNSET) {
        ngx_conf_merge_value(conf->upstream.store, prev->upstream.store, 0);

        conf->upstream.store_lengths = prev->upstream.store_lengths;
        conf->upstream.store_values = prev->upstream.store_values;
    }

    ngx_conf_merge_uint_value(conf->upstream.store_access,
                              prev->upstream.store_access, 0600);

    ngx_conf_merge_uint_value(conf->upstream.next_upstream_tries,
                              prev->upstream.next_upstream_tries, 0);

    ngx_conf_merge_value(conf->upstream.buffering,
                              prev->upstream.buffering, 1);

    ngx_conf_merge_value(conf->upstream.request_buffering,
                              prev->upstream.request_buffering, 1);

    ngx_conf_merge_value(conf->upstream.ignore_client_abort,
                              prev->upstream.ignore_client_abort, 0);

    ngx_conf_merge_value(conf->upstream.force_ranges,
                              prev->upstream.force_ranges, 0);

    ngx_conf_merge_ptr_value(conf->upstream.local,
                              prev->upstream.local, NULL);

    ngx_conf_merge_value(conf->upstream.socket_keepalive,
                              prev->upstream.socket_keepalive, 0);

    ngx_conf_merge_msec_value(conf->upstream.connect_timeout,
                              prev->upstream.connect_timeout, 60000);

    ngx_conf_merge_msec_value(conf->upstream.send_timeout,
                              prev->upstream.send_timeout, 60000);

    ngx_conf_merge_msec_value(conf->upstream.read_timeout,
                              prev->upstream.read_timeout, 60000);

    ngx_conf_merge_msec_value(conf->upstream.next_upstream_timeout,
                              prev->upstream.next_upstream_timeout, 0);

    ngx_conf_merge_size_value(conf->upstream.send_lowat,
                              prev->upstream.send_lowat, 0);

    ngx_conf_merge_size_value(conf->upstream.buffer_size,
                              prev->upstream.buffer_size,
                              (size_t) ngx_pagesize);

    ngx_conf_merge_size_value(conf->upstream.limit_rate,
                              prev->upstream.limit_rate, 0);


    ngx_conf_merge_bufs_value(conf->upstream.bufs, prev->upstream.bufs,
                              8, ngx_pagesize);

    if (conf->upstream.bufs.num < 2) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "there must be at least 2 \"uwsgi_buffers\"");
        return NGX_CONF_ERROR;
    }


    size = conf->upstream.buffer_size;
    if (size < conf->upstream.bufs.size) {
        size = conf->upstream.bufs.size;
    }


    ngx_conf_merge_size_value(conf->upstream.busy_buffers_size_conf,
                              prev->upstream.busy_buffers_size_conf,
                              NGX_CONF_UNSET_SIZE);

    if (conf->upstream.busy_buffers_size_conf == NGX_CONF_UNSET_SIZE) {
        conf->upstream.busy_buffers_size = 2 * size;
    } else {
        conf->upstream.busy_buffers_size =
            conf->upstream.busy_buffers_size_conf;
    }

    if (conf->upstream.busy_buffers_size < size) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
            "\"uwsgi_busy_buffers_size\" must be equal to or greater "
            "than the maximum of the value of \"uwsgi_buffer_size\" and "
            "one of the \"uwsgi_buffers\"");

        return NGX_CONF_ERROR;
    }

    if (conf->upstream.busy_buffers_size
        > (conf->upstream.bufs.num - 1) * conf->upstream.bufs.size)
    {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
            "\"uwsgi_busy_buffers_size\" must be less than "
            "the size of all \"uwsgi_buffers\" minus one buffer");

        return NGX_CONF_ERROR;
    }


    ngx_conf_merge_size_value(conf->upstream.temp_file_write_size_conf,
                              prev->upstream.temp_file_write_size_conf,
                              NGX_CONF_UNSET_SIZE);

    if (conf->upstream.temp_file_write_size_conf == NGX_CONF_UNSET_SIZE) {
        conf->upstream.temp_file_write_size = 2 * size;
    } else {
        conf->upstream.temp_file_write_size =
            conf->upstream.temp_file_write_size_conf;
    }

    if (conf->upstream.temp_file_write_size < size) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
            "\"uwsgi_temp_file_write_size\" must be equal to or greater than "
            "the maximum of the value of \"uwsgi_buffer_size\" and "
            "one of the \"uwsgi_buffers\"");

        return NGX_CONF_ERROR;
    }


    ngx_conf_merge_size_value(conf->upstream.max_temp_file_size_conf,
                              prev->upstream.max_temp_file_size_conf,
                              NGX_CONF_UNSET_SIZE);

    if (conf->upstream.max_temp_file_size_conf == NGX_CONF_UNSET_SIZE) {
        conf->upstream.max_temp_file_size = 1024 * 1024 * 1024;
    } else {
        conf->upstream.max_temp_file_size =
            conf->upstream.max_temp_file_size_conf;
    }

    if (conf->upstream.max_temp_file_size != 0
        && conf->upstream.max_temp_file_size < size)
    {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
            "\"uwsgi_max_temp_file_size\" must be equal to zero to disable "
            "temporary files usage or must be equal to or greater than "
            "the maximum of the value of \"uwsgi_buffer_size\" and "
            "one of the \"uwsgi_buffers\"");

        return NGX_CONF_ERROR;
    }


    ngx_conf_merge_bitmask_value(conf->upstream.ignore_headers,
                                 prev->upstream.ignore_headers,
                                 NGX_CONF_BITMASK_SET);


    ngx_conf_merge_bitmask_value(conf->upstream.next_upstream,
                                 prev->upstream.next_upstream,
                                 (NGX_CONF_BITMASK_SET
                                  |NGX_HTTP_UPSTREAM_FT_ERROR
                                  |NGX_HTTP_UPSTREAM_FT_TIMEOUT));

    if (conf->upstream.next_upstream & NGX_HTTP_UPSTREAM_FT_OFF) {
        conf->upstream.next_upstream = NGX_CONF_BITMASK_SET
                                       |NGX_HTTP_UPSTREAM_FT_OFF;
    }

    if (ngx_conf_merge_path_value(cf, &conf->upstream.temp_path,
                                  prev->upstream.temp_path,
                                  &ngx_http_uwsgi_temp_path)
        != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

#if (NGX_HTTP_CACHE)

    if (conf->upstream.cache == NGX_CONF_UNSET) {
        ngx_conf_merge_value(conf->upstream.cache,
                              prev->upstream.cache, 0);

        conf->upstream.cache_zone = prev->upstream.cache_zone;
        conf->upstream.cache_value = prev->upstream.cache_value;
    }

    if (conf->upstream.cache_zone && conf->upstream.cache_zone->data == NULL) {
        ngx_shm_zone_t  *shm_zone;

        shm_zone = conf->upstream.cache_zone;

        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "\"uwsgi_cache\" zone \"%V\" is unknown",
                           &shm_zone->shm.name);

        return NGX_CONF_ERROR;
    }

    ngx_conf_merge_uint_value(conf->upstream.cache_min_uses,
                              prev->upstream.cache_min_uses, 1);

    ngx_conf_merge_off_value(conf->upstream.cache_max_range_offset,
                              prev->upstream.cache_max_range_offset,
                              NGX_MAX_OFF_T_VALUE);

    ngx_conf_merge_bitmask_value(conf->upstream.cache_use_stale,
                              prev->upstream.cache_use_stale,
                              (NGX_CONF_BITMASK_SET
                               |NGX_HTTP_UPSTREAM_FT_OFF));

    if (conf->upstream.cache_use_stale & NGX_HTTP_UPSTREAM_FT_OFF) {
        conf->upstream.cache_use_stale = NGX_CONF_BITMASK_SET
                                         |NGX_HTTP_UPSTREAM_FT_OFF;
    }

    if (conf->upstream.cache_use_stale & NGX_HTTP_UPSTREAM_FT_ERROR) {
        conf->upstream.cache_use_stale |= NGX_HTTP_UPSTREAM_FT_NOLIVE;
    }

    if (conf->upstream.cache_methods == 0) {
        conf->upstream.cache_methods = prev->upstream.cache_methods;
    }

    conf->upstream.cache_methods |= NGX_HTTP_GET|NGX_HTTP_HEAD;

    ngx_conf_merge_ptr_value(conf->upstream.cache_bypass,
                             prev->upstream.cache_bypass, NULL);

    ngx_conf_merge_ptr_value(conf->upstream.no_cache,
                             prev->upstream.no_cache, NULL);

    ngx_conf_merge_ptr_value(conf->upstream.cache_valid,
                             prev->upstream.cache_valid, NULL);

    if (conf->cache_key.value.data == NULL) {
        conf->cache_key = prev->cache_key;
    }

    if (conf->upstream.cache && conf->cache_key.value.data == NULL) {
        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
                           "no \"uwsgi_cache_key\" for \"uwsgi_cache\"");
    }

    ngx_conf_merge_value(conf->upstream.cache_lock,
                              prev->upstream.cache_lock, 0);

    ngx_conf_merge_msec_value(conf->upstream.cache_lock_timeout,
                              prev->upstream.cache_lock_timeout, 5000);

    ngx_conf_merge_msec_value(conf->upstream.cache_lock_age,
                              prev->upstream.cache_lock_age, 5000);

    ngx_conf_merge_value(conf->upstream.cache_revalidate,
                              prev->upstream.cache_revalidate, 0);

    ngx_conf_merge_value(conf->upstream.cache_background_update,
                              prev->upstream.cache_background_update, 0);

#endif

    ngx_conf_merge_value(conf->upstream.pass_request_headers,
                         prev->upstream.pass_request_headers, 1);
    ngx_conf_merge_value(conf->upstream.pass_request_body,
                         prev->upstream.pass_request_body, 1);

    ngx_conf_merge_value(conf->upstream.intercept_errors,
                         prev->upstream.intercept_errors, 0);

#if (NGX_HTTP_SSL)

    ngx_conf_merge_value(conf->upstream.ssl_session_reuse,
                              prev->upstream.ssl_session_reuse, 1);

    ngx_conf_merge_bitmask_value(conf->ssl_protocols, prev->ssl_protocols,
                                 (NGX_CONF_BITMASK_SET|NGX_SSL_TLSv1
                                  |NGX_SSL_TLSv1_1|NGX_SSL_TLSv1_2));

    ngx_conf_merge_str_value(conf->ssl_ciphers, prev->ssl_ciphers,
                             "DEFAULT");

    if (conf->upstream.ssl_name == NULL) {
        conf->upstream.ssl_name = prev->upstream.ssl_name;
    }

    ngx_conf_merge_value(conf->upstream.ssl_server_name,
                              prev->upstream.ssl_server_name, 0);
    ngx_conf_merge_value(conf->upstream.ssl_verify,
                              prev->upstream.ssl_verify, 0);
    ngx_conf_merge_uint_value(conf->ssl_verify_depth,
                              prev->ssl_verify_depth, 1);
    ngx_conf_merge_str_value(conf->ssl_trusted_certificate,
                              prev->ssl_trusted_certificate, "");
    ngx_conf_merge_str_value(conf->ssl_crl, prev->ssl_crl, "");

    ngx_conf_merge_str_value(conf->ssl_certificate,
                              prev->ssl_certificate, "");
    ngx_conf_merge_str_value(conf->ssl_certificate_key,
                              prev->ssl_certificate_key, "");
    ngx_conf_merge_ptr_value(conf->ssl_passwords, prev->ssl_passwords, NULL);

    ngx_conf_merge_ptr_value(conf->ssl_conf_commands,
                              prev->ssl_conf_commands, NULL);

    if (conf->ssl && ngx_http_uwsgi_set_ssl(cf, conf) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

#endif

    ngx_conf_merge_str_value(conf->uwsgi_string, prev->uwsgi_string, "");

    hash.max_size = 512;
    hash.bucket_size = ngx_align(64, ngx_cacheline_size);
    hash.name = "uwsgi_hide_headers_hash";

    if (ngx_http_upstream_hide_headers_hash(cf, &conf->upstream,
            &prev->upstream, ngx_http_uwsgi_hide_headers, &hash)
        != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

    clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);

    if (clcf->noname
        && conf->upstream.upstream == NULL && conf->uwsgi_lengths == NULL)
    {
        conf->upstream.upstream = prev->upstream.upstream;

        conf->uwsgi_lengths = prev->uwsgi_lengths;
        conf->uwsgi_values = prev->uwsgi_values;

#if (NGX_HTTP_SSL)
        conf->upstream.ssl = prev->upstream.ssl;
#endif
    }

    if (clcf->lmt_excpt && clcf->handler == NULL
        && (conf->upstream.upstream || conf->uwsgi_lengths))
    {
        clcf->handler = ngx_http_uwsgi_handler;
    }

    ngx_conf_merge_uint_value(conf->modifier1, prev->modifier1, 0);
    ngx_conf_merge_uint_value(conf->modifier2, prev->modifier2, 0);

    if (conf->params_source == NULL) {
        conf->params = prev->params;
#if (NGX_HTTP_CACHE)
        conf->params_cache = prev->params_cache;
#endif
        conf->params_source = prev->params_source;
    }

    rc = ngx_http_uwsgi_init_params(cf, conf, &conf->params, NULL);
    if (rc != NGX_OK) {
        return NGX_CONF_ERROR;
    }

#if (NGX_HTTP_CACHE)

    if (conf->upstream.cache) {
        rc = ngx_http_uwsgi_init_params(cf, conf, &conf->params_cache,
                                        ngx_http_uwsgi_cache_headers);
        if (rc != NGX_OK) {
            return NGX_CONF_ERROR;
        }
    }

#endif

    /*
     * special handling to preserve conf->params in the "http" section
     * to inherit it to all servers
     */

    if (prev->params.hash.buckets == NULL
        && conf->params_source == prev->params_source)
    {
        prev->params = conf->params;
#if (NGX_HTTP_CACHE)
        prev->params_cache = conf->params_cache;
#endif
    }

    return NGX_CONF_OK;
}


static ngx_int_t
ngx_http_uwsgi_init_params(ngx_conf_t *cf, ngx_http_uwsgi_loc_conf_t *conf,
    ngx_http_uwsgi_params_t *params, ngx_keyval_t *default_params)
{
    u_char                       *p;
    size_t                        size;
    uintptr_t                    *code;
    ngx_uint_t                    i, nsrc;
    ngx_array_t                   headers_names, params_merged;
    ngx_keyval_t                 *h;
    ngx_hash_key_t               *hk;
    ngx_hash_init_t               hash;
    ngx_http_upstream_param_t    *src, *s;
    ngx_http_script_compile_t     sc;
    ngx_http_script_copy_code_t  *copy;

    if (params->hash.buckets) {
        return NGX_OK;
    }

    if (conf->params_source == NULL && default_params == NULL) {
        params->hash.buckets = (void *) 1;
        return NGX_OK;
    }

    params->lengths = ngx_array_create(cf->pool, 64, 1);
    if (params->lengths == NULL) {
        return NGX_ERROR;
    }

    params->values = ngx_array_create(cf->pool, 512, 1);
    if (params->values == NULL) {
        return NGX_ERROR;
    }

    if (ngx_array_init(&headers_names, cf->temp_pool, 4, sizeof(ngx_hash_key_t))
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    if (conf->params_source) {
        src = conf->params_source->elts;
        nsrc = conf->params_source->nelts;

    } else {
        src = NULL;
        nsrc = 0;
    }

    if (default_params) {
        if (ngx_array_init(&params_merged, cf->temp_pool, 4,
                           sizeof(ngx_http_upstream_param_t))
            != NGX_OK)
        {
            return NGX_ERROR;
        }

        for (i = 0; i < nsrc; i++) {

            s = ngx_array_push(&params_merged);
            if (s == NULL) {
                return NGX_ERROR;
            }

            *s = src[i];
        }

        h = default_params;

        while (h->key.len) {

            src = params_merged.elts;
            nsrc = params_merged.nelts;

            for (i = 0; i < nsrc; i++) {
                if (ngx_strcasecmp(h->key.data, src[i].key.data) == 0) {
                    goto next;
                }
            }

            s = ngx_array_push(&params_merged);
            if (s == NULL) {
                return NGX_ERROR;
            }

            s->key = h->key;
            s->value = h->value;
            s->skip_empty = 1;

        next:

            h++;
        }

        src = params_merged.elts;
        nsrc = params_merged.nelts;
    }

    for (i = 0; i < nsrc; i++) {

        if (src[i].key.len > sizeof("HTTP_") - 1
            && ngx_strncmp(src[i].key.data, "HTTP_", sizeof("HTTP_") - 1) == 0)
        {
            hk = ngx_array_push(&headers_names);
            if (hk == NULL) {
                return NGX_ERROR;
            }

            hk->key.len = src[i].key.len - 5;
            hk->key.data = src[i].key.data + 5;
            hk->key_hash = ngx_hash_key_lc(hk->key.data, hk->key.len);
            hk->value = (void *) 1;

            if (src[i].value.len == 0) {
                continue;
            }
        }

        copy = ngx_array_push_n(params->lengths,
                                sizeof(ngx_http_script_copy_code_t));
        if (copy == NULL) {
            return NGX_ERROR;
        }

        copy->code = (ngx_http_script_code_pt) (void *)
                                                 ngx_http_script_copy_len_code;
        copy->len = src[i].key.len;

        copy = ngx_array_push_n(params->lengths,
                                sizeof(ngx_http_script_copy_code_t));
        if (copy == NULL) {
            return NGX_ERROR;
        }

        copy->code = (ngx_http_script_code_pt) (void *)
                                                 ngx_http_script_copy_len_code;
        copy->len = src[i].skip_empty;


        size = (sizeof(ngx_http_script_copy_code_t)
                + src[i].key.len + sizeof(uintptr_t) - 1)
               & ~(sizeof(uintptr_t) - 1);

        copy = ngx_array_push_n(params->values, size);
        if (copy == NULL) {
            return NGX_ERROR;
        }

        copy->code = ngx_http_script_copy_code;
        copy->len = src[i].key.len;

        p = (u_char *) copy + sizeof(ngx_http_script_copy_code_t);
        ngx_memcpy(p, src[i].key.data, src[i].key.len);


        ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));

        sc.cf = cf;
        sc.source = &src[i].value;
        sc.flushes = &params->flushes;
        sc.lengths = &params->lengths;
        sc.values = &params->values;

        if (ngx_http_script_compile(&sc) != NGX_OK) {
            return NGX_ERROR;
        }

        code = ngx_array_push_n(params->lengths, sizeof(uintptr_t));
        if (code == NULL) {
            return NGX_ERROR;
        }

        *code = (uintptr_t) NULL;


        code = ngx_array_push_n(params->values, sizeof(uintptr_t));
        if (code == NULL) {
            return NGX_ERROR;
        }

        *code = (uintptr_t) NULL;
    }

    code = ngx_array_push_n(params->lengths, sizeof(uintptr_t));
    if (code == NULL) {
        return NGX_ERROR;
    }

    *code = (uintptr_t) NULL;

    params->number = headers_names.nelts;

    hash.hash = &params->hash;
    hash.key = ngx_hash_key_lc;
    hash.max_size = 512;
    hash.bucket_size = 64;
    hash.name = "uwsgi_params_hash";
    hash.pool = cf->pool;
    hash.temp_pool = NULL;

    return ngx_hash_init(&hash, headers_names.elts, headers_names.nelts);
}


static char *
ngx_http_uwsgi_pass(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_uwsgi_loc_conf_t *uwcf = conf;

    size_t                      add;
    ngx_url_t                   u;
    ngx_str_t                  *value, *url;
    ngx_uint_t                  n;
    ngx_http_core_loc_conf_t   *clcf;
    ngx_http_script_compile_t   sc;

    if (uwcf->upstream.upstream || uwcf->uwsgi_lengths) {
        return "is duplicate";
    }

    clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
    clcf->handler = ngx_http_uwsgi_handler;

    value = cf->args->elts;

    url = &value[1];

    n = ngx_http_script_variables_count(url);

    if (n) {

        ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));

        sc.cf = cf;
        sc.source = url;
        sc.lengths = &uwcf->uwsgi_lengths;
        sc.values = &uwcf->uwsgi_values;
        sc.variables = n;
        sc.complete_lengths = 1;
        sc.complete_values = 1;

        if (ngx_http_script_compile(&sc) != NGX_OK) {
            return NGX_CONF_ERROR;
        }

#if (NGX_HTTP_SSL)
        uwcf->ssl = 1;
#endif

        return NGX_CONF_OK;
    }

    if (ngx_strncasecmp(url->data, (u_char *) "uwsgi://", 8) == 0) {
        add = 8;

    } else if (ngx_strncasecmp(url->data, (u_char *) "suwsgi://", 9) == 0) {

#if (NGX_HTTP_SSL)
        add = 9;
        uwcf->ssl = 1;
#else
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "suwsgi protocol requires SSL support");
        return NGX_CONF_ERROR;
#endif

    } else {
        add = 0;
    }

    ngx_memzero(&u, sizeof(ngx_url_t));

    u.url.len = url->len - add;
    u.url.data = url->data + add;
    u.no_resolve = 1;

    uwcf->upstream.upstream = ngx_http_upstream_add(cf, &u, 0);
    if (uwcf->upstream.upstream == NULL) {
        return NGX_CONF_ERROR;
    }

    if (clcf->name.len && clcf->name.data[clcf->name.len - 1] == '/') {
        clcf->auto_redirect = 1;
    }

    return NGX_CONF_OK;
}


static char *
ngx_http_uwsgi_store(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_uwsgi_loc_conf_t *uwcf = conf;

    ngx_str_t                  *value;
    ngx_http_script_compile_t   sc;

    if (uwcf->upstream.store != NGX_CONF_UNSET) {
        return "is duplicate";
    }

    value = cf->args->elts;

    if (ngx_strcmp(value[1].data, "off") == 0) {
        uwcf->upstream.store = 0;
        return NGX_CONF_OK;
    }

#if (NGX_HTTP_CACHE)

    if (uwcf->upstream.cache > 0) {
        return "is incompatible with \"uwsgi_cache\"";
    }

#endif

    uwcf->upstream.store = 1;

    if (ngx_strcmp(value[1].data, "on") == 0) {
        return NGX_CONF_OK;
    }

    /* include the terminating '\0' into script */
    value[1].len++;

    ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));

    sc.cf = cf;
    sc.source = &value[1];
    sc.lengths = &uwcf->upstream.store_lengths;
    sc.values = &uwcf->upstream.store_values;
    sc.variables = ngx_http_script_variables_count(&value[1]);
    sc.complete_lengths = 1;
    sc.complete_values = 1;

    if (ngx_http_script_compile(&sc) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    return NGX_CONF_OK;
}


#if (NGX_HTTP_CACHE)

static char *
ngx_http_uwsgi_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_uwsgi_loc_conf_t *uwcf = conf;

    ngx_str_t                         *value;
    ngx_http_complex_value_t           cv;
    ngx_http_compile_complex_value_t   ccv;

    value = cf->args->elts;

    if (uwcf->upstream.cache != NGX_CONF_UNSET) {
        return "is duplicate";
    }

    if (ngx_strcmp(value[1].data, "off") == 0) {
        uwcf->upstream.cache = 0;
        return NGX_CONF_OK;
    }

    if (uwcf->upstream.store > 0) {
        return "is incompatible with \"uwsgi_store\"";
    }

    uwcf->upstream.cache = 1;

    ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));

    ccv.cf = cf;
    ccv.value = &value[1];
    ccv.complex_value = &cv;

    if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    if (cv.lengths != NULL) {

        uwcf->upstream.cache_value = ngx_palloc(cf->pool,
                                             sizeof(ngx_http_complex_value_t));
        if (uwcf->upstream.cache_value == NULL) {
            return NGX_CONF_ERROR;
        }

        *uwcf->upstream.cache_value = cv;

        return NGX_CONF_OK;
    }

    uwcf->upstream.cache_zone = ngx_shared_memory_add(cf, &value[1], 0,
                                                      &ngx_http_uwsgi_module);
    if (uwcf->upstream.cache_zone == NULL) {
        return NGX_CONF_ERROR;
    }

    return NGX_CONF_OK;
}


static char *
ngx_http_uwsgi_cache_key(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_uwsgi_loc_conf_t *uwcf = conf;

    ngx_str_t                         *value;
    ngx_http_compile_complex_value_t   ccv;

    value = cf->args->elts;

    if (uwcf->cache_key.value.data) {
        return "is duplicate";
    }

    ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));

    ccv.cf = cf;
    ccv.value = &value[1];
    ccv.complex_value = &uwcf->cache_key;

    if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    return NGX_CONF_OK;
}

#endif


#if (NGX_HTTP_SSL)

static char *
ngx_http_uwsgi_ssl_password_file(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_uwsgi_loc_conf_t *uwcf = conf;

    ngx_str_t  *value;

    if (uwcf->ssl_passwords != NGX_CONF_UNSET_PTR) {
        return "is duplicate";
    }

    value = cf->args->elts;

    uwcf->ssl_passwords = ngx_ssl_read_password_file(cf, &value[1]);

    if (uwcf->ssl_passwords == NULL) {
        return NGX_CONF_ERROR;
    }

    return NGX_CONF_OK;
}


static char *
ngx_http_uwsgi_ssl_conf_command_check(ngx_conf_t *cf, void *post, void *data)
{
#ifndef SSL_CONF_FLAG_FILE
    return "is not supported on this platform";
#endif

    return NGX_CONF_OK;
}


static ngx_int_t
ngx_http_uwsgi_set_ssl(ngx_conf_t *cf, ngx_http_uwsgi_loc_conf_t *uwcf)
{
    ngx_pool_cleanup_t  *cln;

    uwcf->upstream.ssl = ngx_pcalloc(cf->pool, sizeof(ngx_ssl_t));
    if (uwcf->upstream.ssl == NULL) {
        return NGX_ERROR;
    }

    uwcf->upstream.ssl->log = cf->log;

    if (ngx_ssl_create(uwcf->upstream.ssl, uwcf->ssl_protocols, NULL)
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    cln = ngx_pool_cleanup_add(cf->pool, 0);
    if (cln == NULL) {
        ngx_ssl_cleanup_ctx(uwcf->upstream.ssl);
        return NGX_ERROR;
    }

    cln->handler = ngx_ssl_cleanup_ctx;
    cln->data = uwcf->upstream.ssl;

    if (uwcf->ssl_certificate.len) {

        if (uwcf->ssl_certificate_key.len == 0) {
            ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                          "no \"uwsgi_ssl_certificate_key\" is defined "
                          "for certificate \"%V\"", &uwcf->ssl_certificate);
            return NGX_ERROR;
        }

        if (ngx_ssl_certificate(cf, uwcf->upstream.ssl, &uwcf->ssl_certificate,
                                &uwcf->ssl_certificate_key, uwcf->ssl_passwords)
            != NGX_OK)
        {
            return NGX_ERROR;
        }
    }

    if (ngx_ssl_ciphers(cf, uwcf->upstream.ssl, &uwcf->ssl_ciphers, 0)
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    if (uwcf->upstream.ssl_verify) {
        if (uwcf->ssl_trusted_certificate.len == 0) {
            ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                      "no uwsgi_ssl_trusted_certificate for uwsgi_ssl_verify");
            return NGX_ERROR;
        }

        if (ngx_ssl_trusted_certificate(cf, uwcf->upstream.ssl,
                                        &uwcf->ssl_trusted_certificate,
                                        uwcf->ssl_verify_depth)
            != NGX_OK)
        {
            return NGX_ERROR;
        }

        if (ngx_ssl_crl(cf, uwcf->upstream.ssl, &uwcf->ssl_crl) != NGX_OK) {
            return NGX_ERROR;
        }
    }

    if (ngx_ssl_client_session_cache(cf, uwcf->upstream.ssl,
                                     uwcf->upstream.ssl_session_reuse)
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    if (ngx_ssl_conf_commands(cf, uwcf->upstream.ssl, uwcf->ssl_conf_commands)
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    return NGX_OK;
}

#endif