Removing code duplication

lib/services/core/serviceclient.js

@@ -372,6 +372,7 @@ ServiceClient.prototype._loadEnvironmentProxyValue = function() {
   } else if (process.env[ServiceClient.EnvironmentVariables.HTTP_PROXY.toLowerCase()]) {
     proxyUrl = process.env[ServiceClient.EnvironmentVariables.HTTP_PROXY.toLowerCase()];
   }
+
   return proxyUrl;
 };
 
@@ -386,13 +387,9 @@ ServiceClient.prototype._loadEnvironmentProxy = function() {
   var proxyUrl = this._loadEnvironmentProxyValue();
 
   if (proxyUrl) {
-    if (!azureutil.stringStartsWith(proxyUrl, 'http')) {
-      proxyUrl = 'http://' + proxyUrl;
-    }
+    var parsedUrl = this._parseHost(proxyUrl);
 
     this.useProxy = true;
-
-    var parsedUrl = url.parse(proxyUrl);
     this.proxyProtocol = parsedUrl.protocol;
     this.proxyPort = parsedUrl.port;
     this.proxyUrl = parsedUrl.hostname;