uncompress the response body transparently if required

lib/adapters/http.js

@@ -7,6 +7,7 @@ var transformData = require('./../helpers/transformData');
 var http = require('http');
 var https = require('https');
 var url = require('url');
+var zlib = require('zlib');
 var pkg = require('./../../package.json');
 var Buffer = require('buffer').Buffer;
 
@@ -59,12 +60,27 @@ module.exports = function httpAdapter(resolve, reject, config) {
   // Create the request
   var transport = parsed.protocol === 'https:' ? https : http;
   var req = transport.request(options, function (res) {
+
+    // uncompress the response body transparently if required
+    var stream = res;
+    switch(res.headers['content-encoding']) {
+      case 'gzip':
+      case 'compress':
+      case 'deflate': {
+        // add the unzipper to the body stream processing pipeline
+        stream = stream.pipe(zlib.createUnzip());
+
+        // remove the content-encoding in order to not confuse downstream operations
+        delete res.headers['content-encoding'];
+      }
+    }
+
     var responseBuffer = [];
-    res.on('data', function (chunk) {
+    stream.on('data', function (chunk) {
       responseBuffer.push(chunk);
     });
 
-    res.on('end', function () {
+    stream.on('end', function () {
       var data = Buffer.concat(responseBuffer);
       if (config.responseType !== 'arraybuffer') {
         data = data.toString('utf8');