Mercurial > hg > nginx-vendor-0-6
diff src/http/modules/ngx_http_not_modified_filter.c @ 0:f0b350454894 NGINX_0_1_0
nginx 0.1.0
*) The first public version.
author | Igor Sysoev <http://sysoev.ru> |
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date | Mon, 04 Oct 2004 00:00:00 +0400 |
parents | |
children | 46833bd150cb |
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new file mode 100644 --- /dev/null +++ b/src/http/modules/ngx_http_not_modified_filter.c @@ -0,0 +1,85 @@ + +/* + * Copyright (C) Igor Sysoev + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> + + + +static ngx_int_t ngx_http_not_modified_filter_init(ngx_cycle_t *cycle); + + +static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = { + NULL, /* pre conf */ + + NULL, /* create main configuration */ + NULL, /* init main configuration */ + + NULL, /* create server configuration */ + NULL, /* merge server configuration */ + + NULL, /* create location configuration */ + NULL /* merge location configuration */ +}; + + +ngx_module_t ngx_http_not_modified_filter_module = { + NGX_MODULE, + &ngx_http_not_modified_filter_module_ctx, /* module context */ + NULL, /* module directives */ + NGX_HTTP_MODULE, /* module type */ + ngx_http_not_modified_filter_init, /* init module */ + NULL /* init child */ +}; + + +static ngx_http_output_header_filter_pt ngx_http_next_header_filter; + + +static ngx_int_t ngx_http_not_modified_header_filter(ngx_http_request_t *r) +{ + time_t ims; + + if (r->headers_out.status != NGX_HTTP_OK + || r->headers_in.if_modified_since == NULL + || r->headers_out.last_modified_time == -1) + { + return ngx_http_next_header_filter(r); + } + + ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data, + r->headers_in.if_modified_since->value.len); + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "http ims:%d lm:%d", ims, r->headers_out.last_modified_time); + + /* + * I think that the equality of the dates is correcter + */ + + if (ims != NGX_ERROR && ims == r->headers_out.last_modified_time) { + r->headers_out.status = NGX_HTTP_NOT_MODIFIED; + r->headers_out.content_type->key.len = 0; + r->headers_out.content_type = NULL; + r->headers_out.content_length_n = -1; + r->headers_out.content_length = NULL; +#if 0 + r->headers_out.accept_ranges->key.len = 0; +#endif + } + + return ngx_http_next_header_filter(r); +} + + +static ngx_int_t ngx_http_not_modified_filter_init(ngx_cycle_t *cycle) +{ + ngx_http_next_header_filter = ngx_http_top_header_filter; + ngx_http_top_header_filter = ngx_http_not_modified_header_filter; + + return NGX_OK; +}