cache: If enabled return HTTP response to RX_OVERFLOW

bin/varnishd/http1/cache_http1_fsm.c

@@ -327,6 +327,10 @@ HTTP1_Session(struct worker *wrk, struct req *req)
 			    cache_param->http_req_size);
 			assert(!WS_IsReserved(req->htc->ws));
 			if (hs < HTC_S_EMPTY) {
+				if (FEATURE(FEATURE_OVERFLOW_HTTP_RESP) && hs == HTC_S_OVERFLOW) {
+					(void)req->transport->minimal_response(req,
+								cache_param->req_overflow_status);
+				}
 				req->acct.req_hdrbytes +=
 				    req->htc->rxbuf_e - req->htc->rxbuf_b;
 				Req_AcctLogCharge(wrk->stats, req);

bin/varnishtest/tests/b00092.vtc

@@ -0,0 +1,28 @@
+varnishtest "HTTP response to RX_OVERFLOW"
+
+# server s1 {} -start
+
+varnish v1 -cliok "param.set http_req_size 500b" -vcl {
+	backend default none;
+} -start
+
+client c1 {
+	txreq -url "/world?hello=world${string,repeat,100,&hello=world}"
+	expect_close
+} -run
+
+varnish v1 -cliok "param.set feature +overflow_http_resp"
+
+client c1 {
+	txreq -url "/world?hello=world${string,repeat,100,&hello=world}"
+	rxresp
+	expect resp.status == 413
+} -run
+
+varnish v1 -cliok "param.set req_overflow_status 414"
+
+client c1 {
+	txreq -url "/world?hello=world${string,repeat,100,_hello-world}"
+	rxresp
+	expect resp.status == 414
+} -run