fix pathname relative redirects. Closes #112

probably some other cases we can cover but meh this fixes
what i need for now

lib/node/index.js

@@ -403,7 +403,14 @@ Request.prototype.buffer = function(val){
 
 Request.prototype.redirect = function(res){
   var url = res.headers.location;
-  if (!~url.indexOf('://')) url = this.protocol + url;
+
+  if (!~url.indexOf('://')) {
+    if (0 != url.indexOf('//')) {
+      url = '//' + this.host + url;
+    }
+    url = this.protocol + url;
+  }
+
   delete this.req;
   this.method = 'HEAD' == this.method
     ? this.method
@@ -476,6 +483,7 @@ Request.prototype.request = function(){
   // request
   var req = this.req = mod.request(options);
   this.protocol = url.protocol;
+  this.host = url.host;
 
   // expose events
   req.on('drain', function(){ self.emit('drain'); });

test/node/redirects.js

@@ -26,6 +26,15 @@ app.post('/movie', function(req, res){
   res.redirect('/movies/all/0');
 });
 
+app.get('/tobi', function(req, res){
+  res.send('tobi');
+});
+
+app.get('/relative', function(req, res){
+  res.set('Location', '/tobi');
+  res.send(302);
+});
+
 app.listen(3003);
 
 describe('request', function(){
@@ -48,6 +57,24 @@ describe('request', function(){
         done();
       });
     })
+
+    describe('when relative', function(){
+      it('should construct the FQDN', function(done){
+        var redirects = [];
+
+        request
+        .get('http://localhost:3003/relative')
+        .on('redirect', function(res){
+          redirects.push(res.headers.location);
+        })
+        .end(function(res){
+          var arr = [];
+          redirects.should.eql(['/tobi']);
+          res.text.should.equal('tobi');
+          done();
+        });
+      })
+    })
   })
 
   describe('req.redirects(n)', function(){