remove awful res.end/res.write noop patch

this removes the res.end/res.write to noop after request end patch,
which is unnecessary and is really weird, because it will stop errors
from triggerring that would normally trigger when this middleware
is not being used.

fixes #8

index.js

@@ -62,11 +62,6 @@ module.exports = function compression(options) {
       , compress = true
       , stream;
 
-    // see #8
-    req.on('close', function(){
-      res.write = res.end = function(){};
-    });
-
     // flush is noop by default
     res.flush = noop;
 

test/test.js

@@ -183,6 +183,37 @@ describe('compress()', function(){
     .end()
   })
 
+  it('should not error when client aborts', function(done){
+    var closed = false
+    var resp
+    var server = createServer({ threshold: 0 }, function (req, res) {
+      resp = res
+      req.on('close', function(){ closed = true })
+      res.setHeader('Content-Type', 'text/plain')
+      res.setHeader('Content-Length', '2048')
+      res.write(new Buffer(1024))
+      res.flush()
+    })
+
+    request(server)
+    .get('/')
+    .set('Accept-Encoding', 'gzip')
+    .request()
+    .on('response', function (res) {
+      var req = this
+      res.headers['content-encoding'].should.equal('gzip')
+      res.once('data', function(){
+        req.abort()
+        setTimeout(function(){
+          closed.should.be.true
+          resp.end(new Buffer(1024))
+          done()
+        }, 10)
+      })
+    })
+    .end()
+  })
+
   describe('threshold', function(){
     it('should not compress responses below the threshold size', function(done){
       var server = createServer({ threshold: '1kb' }, function (req, res) {