From 7d99da77cc179bd1b1fbd21423771be1e57e3b56 Mon Sep 17 00:00:00 2001
From: Richard Hansen <rhansen@rhansen.org>
Date: Tue, 25 Jun 2024 22:22:02 -0400
Subject: [PATCH] header_ok: Fail if the reply is falsy

---
 ddclient.in | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ddclient.in b/ddclient.in
index df3c168..877d8a3 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -3791,6 +3791,10 @@ sub nic_updateable {
 ######################################################################
 sub header_ok {
     my ($host, $line) = @_;
+    if (!$line) {
+        failed("updating %s: no response from server", $host);
+        return 0;
+    }
     $line =~ s/\r?\n.*//s;
     my ($code, $msg) = ($line =~ qr%^\s*HTTP/.*\s+(\d+)\s*(?:\s+([^\s].*))?$%i);
     if (!defined($code)) {