Mercurial > hg > nginx-quic
diff src/http/modules/ngx_http_not_modified_filter.c @ 135:e29909bd9b8a
nginx-0.0.1-2003-09-28-23:29:06 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Sun, 28 Sep 2003 19:29:06 +0000 |
parents | |
children | da00cde00e8a |
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new file mode 100644 --- /dev/null +++ b/src/http/modules/ngx_http_not_modified_filter.c @@ -0,0 +1,74 @@ + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> + + + +static int ngx_http_not_modified_filter_init(ngx_cycle_t *cycle); + + +static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = { + 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 int (*next_header_filter) (ngx_http_request_t *r); + + +static int 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 == NULL) + { + return 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_debug(r->connection->log, "%d %d" _ + ims _ r->headers_out.last_modified_time); + + /* I think that the date equality 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_length = -1; + r->headers_out.content_type->key.len = 0; + r->headers_out.content_type = NULL; + + /* TODO: delete "Accept-Ranges" header + } + + return next_header_filter(r); +} + + +static int ngx_http_not_modified_filter_init(ngx_cycle_t *cycle) +{ + next_header_filter = ngx_http_top_header_filter; + ngx_http_top_header_filter = ngx_http_not_modified_header_filter; + + return NGX_OK; +}