From 985c184d5b5f7bd442af462cfde5f7f597122b13 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 11 Mar 2021 15:37:52 +0100
Subject: [PATCH] tool_operate: bail if set CURLOPT_HTTP09_ALLOWED returns
 error

Closes #6727
---
 src/tool_operate.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/tool_operate.c b/src/tool_operate.c
index 2aebb9ac2..942643290 100644
--- a/src/tool_operate.c
+++ b/src/tool_operate.c
@@ -1460,6 +1460,10 @@ static CURLcode single_transfer(struct GlobalConfig *global,
           /* new in libcurl 7.64.0 */
           my_setopt(curl, CURLOPT_HTTP09_ALLOWED,
                     config->http09_allowed ? 1L : 0L);
+          if(result) {
+            errorf(global, "HTTP/0.9 is not supported in this build!\n");
+            return result;
+          }
 
         } /* (built_in_protos & CURLPROTO_HTTP) */