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static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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ngx_int_t ngx_http_not_modified_header_filter(ngx_http_request_t *r)
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ngx_http_not_modified_header_filter(ngx_http_request_t *r)
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ngx_http_core_loc_conf_t *clcf;
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if (r->headers_out.status != NGX_HTTP_OK
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return ngx_http_next_header_filter(r);
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clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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if (clcf->if_modified_since == NGX_HTTP_IMS_OFF) {
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return ngx_http_next_header_filter(r);
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ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
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r->headers_in.if_modified_since->value.len);
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ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"http ims:%d lm:%d", ims, r->headers_out.last_modified_time);
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* I think that the equality of the dates is correcter
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if (ims != r->headers_out.last_modified_time) {
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if (ims == r->headers_out.last_modified_time) {
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r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
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r->headers_out.content_type.len = 0;
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ngx_http_clear_content_length(r);
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ngx_http_clear_accept_ranges(r);
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if (clcf->if_modified_since == NGX_HTTP_IMS_EXACT
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|| ims < r->headers_out.last_modified_time)
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return ngx_http_next_header_filter(r);
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r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
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r->headers_out.status_line.len = 0;
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r->headers_out.content_type.len = 0;
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ngx_http_clear_content_length(r);
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ngx_http_clear_accept_ranges(r);
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return ngx_http_next_header_filter(r);
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ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf)
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ngx_http_not_modified_filter_init(ngx_conf_t *cf)
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ngx_http_next_header_filter = ngx_http_top_header_filter;
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ngx_http_top_header_filter = ngx_http_not_modified_header_filter;