add req.acceptedEncodings

lib/request.js

@@ -159,6 +159,24 @@ req.range = function(size){
   return parseRange(size, range);
 };
 
+/**
+ * Return an array of encodings.
+ *
+ * Examples:
+ *
+ *     ['gzip', 'deflate']
+ *
+ * @return {Array}
+ * @api public
+ */
+
+req.__defineGetter__('acceptedEncodings', function(){
+  var accept = this.get('Accept-Encoding');
+  return accept
+    ? accept.trim().split(/ *, */)
+    : [];
+});
+
 /**
  * Return an array of Accepted media types
  * ordered from highest quality to lowest.

test/req.acceptedEncodings.js

@@ -0,0 +1,36 @@
+
+var express = require('../')
+  , request = require('./support/http');
+
+describe('req', function(){
+  describe('.acceptedEncodings', function(){
+    it('should return an array of accepted encodings', function(done){
+      var app = express();
+
+      app.use(function(req, res){
+        req.acceptedEncodings.should.eql(['gzip', 'deflate']);
+        res.end();
+      });
+
+      request(app)
+      .get('/')
+      .set('Accept-Encoding', ' gzip, deflate')
+      .expect(200, done);
+    })
+
+    describe('when Accept-Encoding is not present', function(){
+      it('should default to []', function(done){
+        var app = express();
+
+        app.use(function(req, res){
+          req.acceptedEncodings.should.have.length(0);
+          res.end();
+        });
+
+        request(app)
+        .get('/')
+        .expect(200, done);
+      })
+    })
+  })
+})