NGX_HTTP_LINGERING_BUFFER_SIZE 2766 http/ngx_http_request.c     u_char                     buffer[NGX_HTTP_LINGERING_BUFFER_SIZE];
NGX_HTTP_LINGERING_BUFFER_SIZE 2787 http/ngx_http_request.c         n = c->recv(c, buffer, NGX_HTTP_LINGERING_BUFFER_SIZE);