ngx_http_file_cache_set_header  170 src/http/ngx_http_cache.h ngx_int_t ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf);
ngx_http_file_cache_set_header 2825 src/http/ngx_http_upstream.c             if (ngx_http_file_cache_set_header(r, u->buffer.start) != NGX_OK) {