Merge branch 'hotfix/SDK-4933-fix-http-proxy' into 'release/v8.6.0'

SDK-4933. Investigate Curl proxy related issues (Hotfix for v8.6.0)

See merge request sdk/sdk!6327

Author: jgandres

src/posix/net.cpp

@@ -1788,10 +1788,13 @@ void CurlHttpIO::request_proxy_ip()
     NET_debug << "Resolving IPv4 address for proxy: " << proxyhost;
     ares_gethostbyname(ares, proxyhost.c_str(), PF_INET, proxy_ready_callback, httpctx);
 #else
-    // No need to resolve the proxy's IP: cURL will resolve it for us.
-    std::ostringstream ostream;
-    ostream << proxyhost << ":" << proxyport;
-    proxyip = ostream.str();
+    if (!proxyhost.empty() && proxyport)
+    {
+        // No need to resolve the proxy's IP: cURL will resolve it for us.
+        std::ostringstream ostream;
+        ostream << proxyhost << ":" << proxyport;
+        proxyip = ostream.str();
+    }
 #endif
 }
 
@@ -2165,12 +2168,14 @@ void CurlHttpIO::setproxy(const Proxy& proxy)
 
     if (proxy.getProxyType() != Proxy::CUSTOM || !proxy.getProxyURL().size())
     {
-        // automatic proxy is not supported
-        // invalidate inflight proxy changes
+        LOG_debug << "CurlHttpIO::setproxy: Invalid arguments. type: " << proxy.getProxyType()
+                  << " url: " << proxy.getProxyURL() << " Invalidating inflight proxy changes";
         proxyscheme.clear();
         proxyhost.clear();
-
-        // don't use a proxy
+        proxyport = 0;
+        proxyusername.clear();
+        proxypassword.clear();
+        proxytype = Proxy::NONE;
         proxyurl.clear();
 
         // send pending requests without a proxy