http_state        505 http/ngx_http_request.c     r->http_state = NGX_HTTP_READING_REQUEST_STATE;
http_state       1085 http/ngx_http_request.c             r->http_state = NGX_HTTP_PROCESS_REQUEST_STATE;
http_state       2164 http/ngx_http_request.c     r->http_state = NGX_HTTP_WRITING_REQUEST_STATE;
http_state       2593 http/ngx_http_request.c     r->http_state = NGX_HTTP_KEEPALIVE_STATE;
http_state        433 http/ngx_http_request.h     unsigned                          http_state:4;