Added IPv6 support.

lib/client.js

@@ -3,6 +3,7 @@ var https = require("https");
 var json = require("./json");
 var url = require("url");
 var util = require("util");
+var os = require('os');
 
 /*section: client
  *comment: |
@@ -66,11 +67,21 @@ client.prototype.request = function(method, path, params, callback){
         "query": query,
     });
 
+    function is_ipv4_loop_back(interface0) {
+        // 169.254.xx.xx - loop back address for IPv4
+        // if it exists all requests are redirected to localhost
+        return interface0.address.indexOf('169.254.') === 0;
+    }
+
+    var isIPv6 = os.networkInterfaces().en0.find(is_ipv4_loop_back);
+    var family = isIPv6 ? 6 : 4;
+
     var http_options = {
         hostname: this.api_host,
         port: 443,
         method: method.toUpperCase(),
-        path: path
+        path: path,
+        family: family
     };
 
     if(this.proxy_agent){