den test

lib/client.js

@@ -1,6 +1,6 @@
 (function () {
   'use strict';
-  var https = require('https'),
+  const https = require('https'),
     pjson = require('../package.json'),
     Xml2js = require('xml2js'),
     parser = new Xml2js.Parser({explicitArray: false});
@@ -9,31 +9,34 @@
     config.RECURLY_HOST = config.SUBDOMAIN + '.recurly.com';
     return {
 
-      request: function (route, callback, data) {
-        var endpoint = route[0];
-        var method = route[1];
-        var that = this;
-        var options = {
+      request: function (route, callback, data,customHeaders) {
+        const endpoint = route[0];
+        const method = route[1];
+        const that = this;
+        const options = {
           host: config.RECURLY_HOST,
           port: 443,
           path: endpoint,
           method: method,
           headers: {
             Authorization: "Basic " + (new Buffer(config.API_KEY)).toString('base64'),
             Accept: 'application/xml',
-            'Content-Length': (data) ? data.length : 0,
+            'Content-Length':  (data) ? Buffer.byteLength(data, 'utf-8') : 0,
             'User-Agent': "node-recurly/" + pjson.version
           }
         };
 
         if (method.toLowerCase() === 'post' || method.toLowerCase() === 'put') {
-          options.headers['Content-Type'] = 'application/xml';
+          options.headers['Content-Type'] = 'application/xml; charset=utf-8';
           that.debug(data);
         }
+        if(endpoint.lastIndexOf('shipping_addresses') !== -1 ||  (customHeaders &&customHeaders.API_VERSION)) {
+          options.headers['X-Api-Version'] = (customHeaders && customHeaders.API_VERSION)? customHeaders.API_VERSION:2.4;
+        }
         that.debug(options);
-        var req = https.request(options, function (res) {
+        const req = https.request(options, function (res) {
 
-          var responsedata = '';
+          let responsedata = '';
           res.on('data', function (d) {
             responsedata += d;
           });
@@ -93,7 +96,7 @@
           // backward compatibility for not node.js style callbacks
           // TBD: skip in next version?
           else if (callback.length === 1) {
-            var toreturn = {status: 'ok', data: '', headers: res ? res.headers : null };
+            let toreturn = {status: 'ok', data: '', headers: res ? res.headers : null };
             if (err) {
               toreturn.status = 'error';
               if (!res || err === Error || err instanceof Error) {