ngx_http_upstream_upgraded_write_upstream   64 src/http/ngx_http_upstream.c static void ngx_http_upstream_upgraded_write_upstream(ngx_http_request_t *r,
ngx_http_upstream_upgraded_write_upstream 2980 src/http/ngx_http_upstream.c     u->write_event_handler = ngx_http_upstream_upgraded_write_upstream;