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view src/http/ngx_http_special_response.c @ 196:8759b346e431 NGINX_0_3_45

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nginx 0.3.45 *) Feature: the "ssl_verify_client", "ssl_verify_depth", and "ssl_client_certificate" directives. *) Change: the $request_method variable now returns the main request method. *) Change: the ° symbol codes were changed in koi-win conversion table. *) Feature: the euro и N symbols were added to koi-win conversion table. *) Bugfix: if nginx distributed the requests among several backends and some backend failed, then requests intended for this backend was directed to one live backend only instead of being distributed among the rest.
author Igor Sysoev <http://sysoev.ru>
date Sat, 06 May 2006 00:00:00 +0400
parents 54aabf2b0bc6
children dd6c66b5b0e2
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 */


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


static u_char error_tail[] =
"<hr><center>" NGINX_VER "</center>" CRLF
"</body>" CRLF
"</html>" CRLF
;


static u_char ngx_http_msie_stub[] =
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
;


static char error_301_page[] =
"<html>" CRLF
"<head><title>301 Moved Permanently</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>301 Moved Permanently</h1></center>" CRLF
;


static char error_302_page[] =
"<html>" CRLF
"<head><title>302 Found</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>302 Found</h1></center>" CRLF
;


static char error_400_page[] =
"<html>" CRLF
"<head><title>400 Bad Request</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>400 Bad Request</h1></center>" CRLF
;


static char error_401_page[] =
"<html>" CRLF
"<head><title>401 Authorization Required</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>401 Authorization Required</h1></center>" CRLF
;


static char error_402_page[] =
"<html>" CRLF
"<head><title>402 Payment Required</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>402 Payment Required</h1></center>" CRLF
;


static char error_403_page[] =
"<html>" CRLF
"<head><title>403 Forbidden</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>403 Forbidden</h1></center>" CRLF
;


static char error_404_page[] =
"<html>" CRLF
"<head><title>404 Not Found</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>404 Not Found</h1></center>" CRLF
;


static char error_405_page[] =
"<html>" CRLF
"<head><title>405 Not Allowed</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>405 Not Allowed</h1></center>" CRLF
;


static char error_406_page[] =
"<html>" CRLF
"<head><title>406 Not Acceptable</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>406 Not Acceptable</h1></center>" CRLF
;


static char error_408_page[] =
"<html>" CRLF
"<head><title>408 Request Time-out</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>408 Request Time-out</h1></center>" CRLF
;


static char error_409_page[] =
"<html>" CRLF
"<head><title>409 Conflict</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>409 Conflict</h1></center>" CRLF
;


static char error_410_page[] =
"<html>" CRLF
"<head><title>410 Gone</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>410 Gone</h1></center>" CRLF
;


static char error_411_page[] =
"<html>" CRLF
"<head><title>411 Length Required</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>411 Length Required</h1></center>" CRLF
;


static char error_413_page[] =
"<html>" CRLF
"<head><title>413 Request Entity Too Large</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>413 Request Entity Too Large</h1></center>" CRLF
;


static char error_414_page[] =
"<html>" CRLF
"<head><title>414 Request-URI Too Large</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>414 Request-URI Too Large</h1></center>" CRLF
;


static char error_415_page[] =
"<html>" CRLF
"<head><title>415 Unsupported Media Type</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>415 Unsupported Media Type</h1></center>" CRLF
;


static char error_416_page[] =
"<html>" CRLF
"<head><title>416 Requested Range Not Satisfiable</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>416 Requested Range Not Satisfiable</h1></center>" CRLF
;


static char error_495_page[] =
"<html>" CRLF
"<head><title>400 The SSL certificate error</title></head>"
CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>400 Bad Request</h1></center>" CRLF
"<center>The SSL certificate error</center>" CRLF
;


static char error_496_page[] =
"<html>" CRLF
"<head><title>400 No required SSL certificate was sent</title></head>"
CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>400 Bad Request</h1></center>" CRLF
"<center>No required SSL certificate was sent</center>" CRLF
;


static char error_497_page[] =
"<html>" CRLF
"<head><title>400 The plain HTTP request was sent to HTTPS port</title></head>"
CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>400 Bad Request</h1></center>" CRLF
"<center>The plain HTTP request was sent to HTTPS port</center>" CRLF
;


static char error_500_page[] =
"<html>" CRLF
"<head><title>500 Internal Server Error</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>500 Internal Server Error</h1></center>" CRLF
;


static char error_501_page[] =
"<html>" CRLF
"<head><title>501 Method Not Implemented</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>501 Method Not Implemented</h1></center>" CRLF
;


static char error_502_page[] =
"<html>" CRLF
"<head><title>502 Bad Gateway</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>502 Bad Gateway</h1></center>" CRLF
;


static char error_503_page[] =
"<html>" CRLF
"<head><title>503 Service Temporarily Unavailable</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>503 Service Temporarily Unavailable</h1></center>" CRLF
;


static char error_504_page[] =
"<html>" CRLF
"<head><title>504 Gateway Time-out</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>504 Gateway Time-out</h1></center>" CRLF
;


static char error_507_page[] =
"<html>" CRLF
"<head><title>507 Insufficient Storage</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>507 Insufficient Storage</h1></center>" CRLF
;


static ngx_str_t error_pages[] = {

    ngx_null_string,             /* 201, 204 */

#define NGX_HTTP_LEVEL_200  1

    /* ngx_null_string, */       /* 300 */
    ngx_string(error_301_page),
    ngx_string(error_302_page),
    ngx_null_string,             /* 303 */

#define NGX_HTTP_LEVEL_300  3

    ngx_string(error_400_page),
    ngx_string(error_401_page),
    ngx_string(error_402_page),
    ngx_string(error_403_page),
    ngx_string(error_404_page),
    ngx_string(error_405_page),
    ngx_string(error_406_page),
    ngx_null_string,             /* 407 */
    ngx_string(error_408_page),
    ngx_string(error_409_page),
    ngx_string(error_410_page),
    ngx_string(error_411_page),
    ngx_null_string,             /* 412 */
    ngx_string(error_413_page),
    ngx_string(error_414_page),
    ngx_string(error_415_page),
    ngx_string(error_416_page),

#define NGX_HTTP_LEVEL_400  17

    ngx_string(error_495_page),  /* 495, https certificate error */
    ngx_string(error_496_page),  /* 496, https no certificate */
    ngx_string(error_497_page),  /* 497, http to https */
    ngx_string(error_404_page),  /* 498, invalid host name */
    ngx_null_string,             /* 499, client had closed connection */

    ngx_string(error_500_page),
    ngx_string(error_501_page),
    ngx_string(error_502_page),
    ngx_string(error_503_page),
    ngx_string(error_504_page),
    ngx_null_string,             /* 505 */
    ngx_null_string,             /* 506 */
    ngx_string(error_507_page)
};


ngx_int_t
ngx_http_special_response_handler(ngx_http_request_t *r, ngx_int_t error)
{
    ngx_int_t                  rc;
    ngx_uint_t                 i, err, msie_padding;
    ngx_buf_t                 *b;
    ngx_chain_t               *out, *cl;
    ngx_http_err_page_t       *err_page;
    ngx_http_core_loc_conf_t  *clcf;

    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http special response: %d, \"%V\"", error, &r->uri);

    rc = ngx_http_discard_body(r);

    if (rc == NGX_HTTP_INTERNAL_SERVER_ERROR) {
        error = NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    r->headers_out.status = error;

    if (r->keepalive != 0) {
        switch (error) {
            case NGX_HTTP_BAD_REQUEST:
            case NGX_HTTP_REQUEST_ENTITY_TOO_LARGE:
            case NGX_HTTP_REQUEST_URI_TOO_LARGE:
            case NGX_HTTP_TO_HTTPS:
            case NGX_HTTPS_CERT_ERROR:
            case NGX_HTTPS_NO_CERT:
            case NGX_HTTP_INTERNAL_SERVER_ERROR:
                r->keepalive = 0;
        }
    }

    if (r->lingering_close == 1) {
        switch (error) {
            case NGX_HTTP_BAD_REQUEST:
            case NGX_HTTP_TO_HTTPS:
            case NGX_HTTPS_CERT_ERROR:
            case NGX_HTTPS_NO_CERT:
                r->lingering_close = 0;
        }
    }

    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

    if (r->err_ctx == NULL && clcf->error_pages) {

        err_page = clcf->error_pages->elts;

        for (i = 0; i < clcf->error_pages->nelts; i++) {

            if (err_page[i].status == error) {
                r->err_status = err_page[i].overwrite;
                r->err_ctx = r->ctx;

                r->method = NGX_HTTP_GET;

                if (err_page[i].uri.data[0] == '/') {
                    return ngx_http_internal_redirect(r, &err_page[i].uri,
                                                      NULL);
                }

                r->headers_out.location =
                                        ngx_list_push(&r->headers_out.headers);

                if (r->headers_out.location) {
                    r->err_status = NGX_HTTP_MOVED_TEMPORARILY;
                    error = NGX_HTTP_MOVED_TEMPORARILY;

                    r->headers_out.location->hash = 1;
                    r->headers_out.location->key.len = sizeof("Location") - 1;
                    r->headers_out.location->key.data = (u_char *) "Location";
                    r->headers_out.location->value = err_page[i].uri;

                } else {
                    error = NGX_HTTP_INTERNAL_SERVER_ERROR;
                }
            }
        }
    }

    if (error == NGX_HTTP_CREATED) {
        /* 201 */
        err = 0;
        r->header_only = 1;

    } else if (error == NGX_HTTP_NO_CONTENT) {
        /* 204 */
        err = 0;

    } else if (error < NGX_HTTP_BAD_REQUEST) {
        /* 3XX */
        err = error - NGX_HTTP_MOVED_PERMANENTLY + NGX_HTTP_LEVEL_200;

    } else if (error < NGX_HTTP_OWN_CODES) {
        /* 4XX */
        err = error - NGX_HTTP_BAD_REQUEST + NGX_HTTP_LEVEL_200
                                           + NGX_HTTP_LEVEL_300;

    } else {
        /* 49X, 5XX */
        err = error - NGX_HTTP_OWN_CODES + NGX_HTTP_LEVEL_200
                                         + NGX_HTTP_LEVEL_300
                                         + NGX_HTTP_LEVEL_400;
        switch (error) {
            case NGX_HTTP_TO_HTTPS:
            case NGX_HTTPS_CERT_ERROR:
            case NGX_HTTPS_NO_CERT:
                r->headers_out.status = NGX_HTTP_BAD_REQUEST;
                error = NGX_HTTP_BAD_REQUEST;
                break;
        }
    }

    msie_padding = 0;

    if (error_pages[err].len) {
        r->headers_out.content_length_n = error_pages[err].len
                                          + sizeof(error_tail) - 1;

        if (clcf->msie_padding
            && r->headers_in.msie
            && r->http_version >= NGX_HTTP_VERSION_10
            && error >= NGX_HTTP_BAD_REQUEST
            && error != NGX_HTTP_REQUEST_URI_TOO_LARGE)
        {
            r->headers_out.content_length_n += sizeof(ngx_http_msie_stub) - 1;
            msie_padding = 1;
        }

        r->headers_out.content_type.len = sizeof("text/html") - 1;
        r->headers_out.content_type.data = (u_char *) "text/html";

    } else {
        r->headers_out.content_length_n = -1;
    }

    if (r->headers_out.content_length) {
        r->headers_out.content_length->hash = 0;
        r->headers_out.content_length = NULL;
    }

    ngx_http_clear_accept_ranges(r);
    ngx_http_clear_last_modified(r);

    rc = ngx_http_send_header(r);

    if (rc == NGX_ERROR || r->header_only) {
        return rc;
    }

    if (error_pages[err].len == 0) {
        return NGX_OK;
    }


    b = ngx_calloc_buf(r->pool);
    if (b == NULL) {
        return NGX_ERROR;
    }

    b->memory = 1;
    b->pos = error_pages[err].data;
    b->last = error_pages[err].data + error_pages[err].len;

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

    cl->buf = b;
    out = cl;


    b = ngx_calloc_buf(r->pool);
    if (b == NULL) {
        return NGX_ERROR;
    }

    b->memory = 1;
    b->pos = error_tail;
    b->last = error_tail + sizeof(error_tail) - 1;

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

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

    if (msie_padding) {
        b = ngx_calloc_buf(r->pool);
        if (b == NULL) {
            return NGX_ERROR;
        }

        b->memory = 1;
        b->pos = ngx_http_msie_stub;
        b->last = ngx_http_msie_stub + sizeof(ngx_http_msie_stub) - 1;

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

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

    if (r == r->main) {
        b->last_buf = 1;
    }

    b->last_in_chain = 1;

    cl->next = NULL;

    return ngx_http_output_filter(r, out);
}