http_ctx         2446 http/ngx_http_core_module.c     ngx_http_conf_ctx_t         *ctx, *http_ctx;
http_ctx         2456 http/ngx_http_core_module.c     http_ctx = cf->ctx;
http_ctx         2457 http/ngx_http_core_module.c     ctx->main_conf = http_ctx->main_conf;
http_ctx         3953 http/ngx_http_upstream.c     ngx_http_conf_ctx_t           *ctx, *http_ctx;
http_ctx         3978 http/ngx_http_upstream.c     http_ctx = cf->ctx;
http_ctx         3979 http/ngx_http_upstream.c     ctx->main_conf = http_ctx->main_conf;