Bug 1671844 - PAC isPlainHostName() matching ipv6 addresses r=valentin,necko-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D99021

netwerk/base/ProxyAutoConfig.cpp

@@ -94,7 +94,7 @@ static const char sAsciiPacUtils[] =
     "}\n"
     ""
     "function isPlainHostName(host) {\n"
-    "    return (host.search('\\\\.') == -1);\n"
+    "    return (host.search('(\\\\.)|:') == -1);\n"
     "}\n"
     ""
     "function isResolvable(host) {\n"