NGX_HTTP_UPSTREAM_FT_HTTP_502  217 src/http/modules/ngx_http_proxy_module.c     { ngx_string("http_502"), NGX_HTTP_UPSTREAM_FT_HTTP_502 },
NGX_HTTP_UPSTREAM_FT_HTTP_502  404 src/http/ngx_http_upstream.c     { 502, NGX_HTTP_UPSTREAM_FT_HTTP_502 },
NGX_HTTP_UPSTREAM_FT_HTTP_502   36 src/http/ngx_http_upstream.h                                              |NGX_HTTP_UPSTREAM_FT_HTTP_502  \