NGX_HTTP_UPSTREAM_FT_HTTP_504  152 http/modules/ngx_http_proxy_module.c     { ngx_string("http_504"), NGX_HTTP_UPSTREAM_FT_HTTP_504 },
NGX_HTTP_UPSTREAM_FT_HTTP_504  346 http/ngx_http_upstream.c     { 504, NGX_HTTP_UPSTREAM_FT_HTTP_504 },
NGX_HTTP_UPSTREAM_FT_HTTP_504   36 http/ngx_http_upstream.h                                              |NGX_HTTP_UPSTREAM_FT_HTTP_504  \