AP_SERVER_PROTOCOL  333 modules/http/http_filters.c                 tmp = apr_pstrcat(f->r->pool, AP_SERVER_PROTOCOL, " ",
AP_SERVER_PROTOCOL  849 modules/http/http_filters.c         *protocol = AP_SERVER_PROTOCOL;
AP_SERVER_PROTOCOL 1659 server/protocol.c     ap_fputstrs(x.f, x.bb, AP_SERVER_PROTOCOL, " ", r->status_line, CRLF, NULL);