NGX_HTTP_UPSTREAM_FT_HTTP_502 150 http/modules/ngx_http_proxy_module.c { ngx_string("http_502"), NGX_HTTP_UPSTREAM_FT_HTTP_502 }, NGX_HTTP_UPSTREAM_FT_HTTP_502 344 http/ngx_http_upstream.c { 502, NGX_HTTP_UPSTREAM_FT_HTTP_502 }, NGX_HTTP_UPSTREAM_FT_HTTP_502 34 http/ngx_http_upstream.h |NGX_HTTP_UPSTREAM_FT_HTTP_502 \