diff --git a/examples/eventlet_longpoll.py b/examples/eventlet_longpoll.py
new file mode 100644
index 00000000..97ba6b61
--- /dev/null
+++ b/examples/eventlet_longpoll.py
@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -
+#
+# This file is part of grainbows released under the MIT license. 
+# See the NOTICE for more information.
+
+import eventlet
+import time
+eventlet.monkey_patch(all=False, os=True, select=True, socket=True)
+
+class TestIter(object):
+    
+    def __iter__(self):
+        lines = ['line 1\n', 'line 2\n']
+        for line in lines:
+            yield line
+            time.sleep(10)
+
+def app(environ, start_response):
+    """Application which cooperatively pauses 10 seconds before responding"""
+    data = 'Hello, World!\n'
+    status = '200 OK'
+    response_headers = [
+        ('Content-type','text/plain'),
+        ('Transfer-Encoding', "chunked"),
+    ]
+    print 'request received'
+    start_response(status, response_headers)
+    return TestIter()
+    
\ No newline at end of file
diff --git a/examples/eventlet_test.py b/examples/eventlet_test.py
new file mode 100644
index 00000000..f2d3ce11
--- /dev/null
+++ b/examples/eventlet_test.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -
+#
+# This file is part of grainbows released under the MIT license. 
+# See the NOTICE for more information.
+
+from wsgiref.validate import validator
+
+import eventlet
+
+eventlet.monkey_patch(all=False, os=False, select=True, socket=True)
+
+
+@validator
+def app(environ, start_response):
+    """Application which cooperatively pauses 10 seconds before responding"""
+    data = 'Hello, World!\n'
+    status = '200 OK'
+    response_headers = [
+        ('Content-type','text/plain'),
+        ('Content-Length', str(len(data)))    ]
+    print 'request received, pausing 10 seconds'
+    eventlet.sleep(10)
+    start_response(status, response_headers)
+    return iter([data])
\ No newline at end of file
diff --git a/examples/gevent_longpoll.py b/examples/gevent_longpoll.py
new file mode 100644
index 00000000..d308aa5c
--- /dev/null
+++ b/examples/gevent_longpoll.py
@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -
+#
+# This file is part of grainbows released under the MIT license. 
+# See the NOTICE for more information.
+
+
+import time
+class TestIter(object):
+    
+    def __iter__(self):
+        lines = ['line 1', 'line 2']
+        for line in lines:
+            yield line
+            time.sleep(10)
+
+def app(environ, start_response):
+    """Application which cooperatively pauses 10 seconds before responding"""
+    data = 'Hello, World!\n'
+    status = '200 OK'
+    response_headers = [
+        ('Content-type','text/plain'),
+        ('Transfer-Encoding', "chunked"),
+    ]
+    print 'request received'
+    start_response(status, response_headers)
+    return TestIter()
diff --git a/examples/gevent_websocket.py b/examples/gevent_websocket.py
new file mode 100644
index 00000000..a5ecda0d
--- /dev/null
+++ b/examples/gevent_websocket.py
@@ -0,0 +1,141 @@
+# -*- coding: utf-8 -
+#
+# This file is part of grainbow released under the MIT license. 
+# See the NOTICE for more information.
+#
+# Example code from Eventlet sources
+
+import collections
+import errno
+from grainbows.worker_base import ALREADY_HANDLED
+from eventlet import pools
+import socket
+import gevent
+from gevent.pool import Pool
+
+class WebSocketWSGI(object):
+    def __init__(self, handler, origin):
+        self.handler = handler
+        self.origin = origin
+    
+    def verify_client(self, ws):
+        pass
+
+    def __call__(self, environ, start_response):
+        if not (environ['HTTP_CONNECTION'] == 'Upgrade' and
+            environ['HTTP_UPGRADE'] == 'WebSocket'):
+            # need to check a few more things here for true compliance
+            start_response('400 Bad Request', [('Connection','close')])
+            return []
+                    
+        sock = environ['wsgi.input'].get_socket()
+        ws = WebSocket(sock, 
+            environ.get('HTTP_ORIGIN'),
+            environ.get('HTTP_WEBSOCKET_PROTOCOL'),
+            environ.get('PATH_INFO'))
+        self.verify_client(ws)
+        handshake_reply = ("HTTP/1.1 101 Web Socket Protocol Handshake\r\n"
+                   "Upgrade: WebSocket\r\n"
+                   "Connection: Upgrade\r\n"
+                   "WebSocket-Origin: %s\r\n"
+                   "WebSocket-Location: ws://%s%s\r\n\r\n" % (
+                        self.origin, 
+                        environ.get('HTTP_HOST'), 
+                        ws.path))                                       
+        sock.sendall(handshake_reply)
+        try:
+            self.handler(ws)
+        except socket.error, e:
+            if e[0] != errno.EPIPE:
+                raise
+        # use this undocumented feature of grainbows to ensure that it
+        # doesn't barf on the fact that we didn't call start_response
+        return ALREADY_HANDLED
+
+def parse_messages(buf):
+    """ Parses for messages in the buffer *buf*.  It is assumed that
+    the buffer contains the start character for a message, but that it
+    may contain only part of the rest of the message. NOTE: only understands
+    lengthless messages for now.
+    
+    Returns an array of messages, and the buffer remainder that didn't contain 
+    any full messages."""
+    msgs = []
+    end_idx = 0
+    while buf:
+        assert ord(buf[0]) == 0, "Don't understand how to parse this type of message: %r" % buf
+        end_idx = buf.find("\xFF")
+        if end_idx == -1:
+            break
+        msgs.append(buf[1:end_idx].decode('utf-8', 'replace'))
+        buf = buf[end_idx+1:]
+    return msgs, buf
+        
+def format_message(message):
+    # TODO support iterable messages
+    if isinstance(message, unicode):
+        message = message.encode('utf-8')
+    elif not isinstance(message, str):
+        message = str(message)
+    packed = "\x00%s\xFF" % message
+    return packed
+
+
+class WebSocket(object):
+    def __init__(self, sock, origin, protocol, path):
+        self.sock = sock
+        self.origin = origin
+        self.protocol = protocol
+        self.path = path
+        self._buf = ""
+        self._msgs = collections.deque()
+    
+    def send(self, message):
+        packed = format_message(message)
+        # if two greenthreads are trying to send at the same time
+        # on the same socket, sendlock prevents interleaving and corruption
+        self.sock.sendall(packed)
+            
+    def wait(self):
+        while not self._msgs:
+            # no parsed messages, must mean buf needs more data
+            delta = self.sock.recv(1024)
+            if delta == '':
+                return None
+            self._buf += delta
+            msgs, self._buf = parse_messages(self._buf)
+            self._msgs.extend(msgs)
+        return self._msgs.popleft()
+        
+
+# demo app
+import os
+import random
+def handle(ws):
+    """  This is the websocket handler function.  Note that we 
+    can dispatch based on path in here, too."""
+    if ws.path == '/echo':
+        while True:
+            m = ws.wait()
+            if m is None:
+                break
+            ws.send(m)
+            
+    elif ws.path == '/data':
+        for i in xrange(10000):
+            ws.send("0 %s %s\n" % (i, random.random()))
+            gevent.sleep(0.1)
+                            
+wsapp = WebSocketWSGI(handle, 'http://localhost:8000')
+def app(environ, start_response):
+    """ This resolves to the web page or the websocket depending on
+    the path."""
+    if environ['PATH_INFO'] == '/' or environ['PATH_INFO'] == "":
+        data = open(os.path.join(
+                     os.path.dirname(__file__), 
+                     'websocket.html')).read()
+        start_response('200 OK', [('Content-Type', 'text/html'),
+                                 ('Content-Length', len(data))])
+        return [data]
+    else:
+        return wsapp(environ, start_response)
diff --git a/examples/gunicorn.conf.py b/examples/gunicorn.conf.py
new file mode 100644
index 00000000..664afb79
--- /dev/null
+++ b/examples/gunicorn.conf.py
@@ -0,0 +1,2 @@
+arbiter = "egg:gunicorn#eventlet"
+worker_connections = 1000
diff --git a/examples/test_keepalive.py b/examples/test_keepalive.py
new file mode 100644
index 00000000..8a4f99ad
--- /dev/null
+++ b/examples/test_keepalive.py
@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -
+#
+# This file is part of grainbows released under the MIT license. 
+# See the NOTICE for more information.
+
+from wsgiref.validate import validator
+
+
+def app(environ, start_response):
+    """Application which cooperatively pauses 10 seconds before responding"""
+    data = 'Hello, World!\n'
+    status = '200 OK'
+    response_headers = [
+        ('Content-type','text/plain'),
+        ('Content-Length', str(len(data)))    ]
+    start_response(status, response_headers)
+    return iter([data])
\ No newline at end of file
diff --git a/examples/websocket.html b/examples/websocket.html
new file mode 100644
index 00000000..ba4cc494
--- /dev/null
+++ b/examples/websocket.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<head>
+<!-- idea and code swiped from 
+http://assorted.svn.sourceforge.net/viewvc/assorted/real-time-plotter/trunk/src/rtp.html?view=markup -->
+<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js"></script>
+<script src="http://people.iola.dk/olau/flot/jquery.flot.js"></script>
+<script>
+window.onload = function() {
+    var data = {};
+    var s = new WebSocket("ws://localhost:8000/data");
+    s.onopen = function() { 
+        //alert('open');
+        s.send('hi');
+    };
+    s.onmessage = function(e) {
+      //alert('got ' + e.data);
+      var lines = e.data.split('\n');
+      for (var i = 0; i < lines.length - 1; i++) {
+        var parts = lines[i].split(' ');
+        var d = parts[0], x = parseFloat(parts[1]), y = parseFloat(parts[2]);
+        if (!(d in data)) data[d] = [];
+        data[d].push([x,y]);
+      }
+      var plots = [];
+      for (var d in data) plots.push( { data: data[d].slice(data[d].length - 200) } );
+      $.plot( $("#holder"), plots,
+              {
+                series: {
+                  lines: { show: true, fill: true },
+                },
+                yaxis: { min: 0 },
+              } );
+
+      s.send('');
+    };
+};
+</script>
+</head>
+<body>
+<h3>Plot</h3>
+<div id="holder" style="width:600px;height:300px"></div>
+</body>
+</html>
\ No newline at end of file
diff --git a/examples/websocket.py b/examples/websocket.py
new file mode 100644
index 00000000..81d65453
--- /dev/null
+++ b/examples/websocket.py
@@ -0,0 +1,147 @@
+# -*- coding: utf-8 -
+#
+# This file is part of grainbow released under the MIT license. 
+# See the NOTICE for more information.
+#
+# Example code from Eventlet sources
+
+
+import collections
+import errno
+from grainbows.worker_base import ALREADY_HANDLED
+from eventlet import pools
+import socket
+import eventlet
+from eventlet.common import get_errno
+
+class WebSocketWSGI(object):
+    def __init__(self, handler, origin):
+        self.handler = handler
+        self.origin = origin
+    
+    def verify_client(self, ws):
+        pass
+
+    def __call__(self, environ, start_response):
+        if not (environ['HTTP_CONNECTION'] == 'Upgrade' and
+            environ['HTTP_UPGRADE'] == 'WebSocket'):
+            # need to check a few more things here for true compliance
+            start_response('400 Bad Request', [('Connection','close')])
+            return []
+                    
+        sock = environ['wsgi.input'].get_socket()
+        ws = WebSocket(sock, 
+            environ.get('HTTP_ORIGIN'),
+            environ.get('HTTP_WEBSOCKET_PROTOCOL'),
+            environ.get('PATH_INFO'))
+        self.verify_client(ws)
+        handshake_reply = ("HTTP/1.1 101 Web Socket Protocol Handshake\r\n"
+                   "Upgrade: WebSocket\r\n"
+                   "Connection: Upgrade\r\n"
+                   "WebSocket-Origin: %s\r\n"
+                   "WebSocket-Location: ws://%s%s\r\n\r\n" % (
+                        self.origin, 
+                        environ.get('HTTP_HOST'), 
+                        ws.path))                                       
+        sock.sendall(handshake_reply)
+        try:
+            self.handler(ws)
+        except socket.error, e:
+            if get_errno(e) != errno.EPIPE:
+                raise
+        # use this undocumented feature of grainbows to ensure that it
+        # doesn't barf on the fact that we didn't call start_response
+        return ALREADY_HANDLED
+
+def parse_messages(buf):
+    """ Parses for messages in the buffer *buf*.  It is assumed that
+    the buffer contains the start character for a message, but that it
+    may contain only part of the rest of the message. NOTE: only understands
+    lengthless messages for now.
+    
+    Returns an array of messages, and the buffer remainder that didn't contain 
+    any full messages."""
+    msgs = []
+    end_idx = 0
+    while buf:
+        assert ord(buf[0]) == 0, "Don't understand how to parse this type of message: %r" % buf
+        end_idx = buf.find("\xFF")
+        if end_idx == -1:
+            break
+        msgs.append(buf[1:end_idx].decode('utf-8', 'replace'))
+        buf = buf[end_idx+1:]
+    return msgs, buf
+        
+def format_message(message):
+    # TODO support iterable messages
+    if isinstance(message, unicode):
+        message = message.encode('utf-8')
+    elif not isinstance(message, str):
+        message = str(message)
+    packed = "\x00%s\xFF" % message
+    return packed
+
+
+class WebSocket(object):
+    def __init__(self, sock, origin, protocol, path):
+        self.sock = sock
+        self.origin = origin
+        self.protocol = protocol
+        self.path = path
+        self._buf = ""
+        self._msgs = collections.deque()
+        self._sendlock = pools.TokenPool(1)
+    
+    def send(self, message):
+        packed = format_message(message)
+        # if two greenthreads are trying to send at the same time
+        # on the same socket, sendlock prevents interleaving and corruption
+        t = self._sendlock.get()
+        try:
+            self.sock.sendall(packed)
+        finally:
+            self._sendlock.put(t)
+            
+    def wait(self):
+        while not self._msgs:
+            # no parsed messages, must mean buf needs more data
+            delta = self.sock.recv(1024)
+            if delta == '':
+                return None
+            self._buf += delta
+            msgs, self._buf = parse_messages(self._buf)
+            self._msgs.extend(msgs)
+        return self._msgs.popleft()
+        
+
+# demo app
+import os
+import random
+def handle(ws):
+    """  This is the websocket handler function.  Note that we 
+    can dispatch based on path in here, too."""
+    if ws.path == '/echo':
+        while True:
+            m = ws.wait()
+            if m is None:
+                break
+            ws.send(m)
+            
+    elif ws.path == '/data':
+        for i in xrange(10000):
+            ws.send("0 %s %s\n" % (i, random.random()))
+            eventlet.sleep(0.1)
+                            
+wsapp = WebSocketWSGI(handle, 'http://localhost:8000')
+def app(environ, start_response):
+    """ This resolves to the web page or the websocket depending on
+    the path."""
+    if environ['PATH_INFO'] == '/' or environ['PATH_INFO'] == "":
+        data = open(os.path.join(
+                     os.path.dirname(__file__), 
+                     'websocket.html')).read()
+        start_response('200 OK', [('Content-Type', 'text/html'),
+                                 ('Content-Length', len(data))])
+        return [data]
+    else:
+        return wsapp(environ, start_response)
diff --git a/gunicorn/arbiter.py b/gunicorn/arbiter.py
index 11da6fdb..0da150a1 100644
--- a/gunicorn/arbiter.py
+++ b/gunicorn/arbiter.py
@@ -154,8 +154,8 @@ class Arbiter(object):
 
         self.stop()
         self.log.info("Shutting down: %s" % self.master_name)
-        if self.pidfile:
-            del self.pidfile
+        #if self.pidfile:
+        #    del self.pidfile
         sys.exit(0)
         
     def handle_chld(self, sig, frame):
diff --git a/gunicorn/async/__init__.py b/gunicorn/async/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/gunicorn/async/base.py b/gunicorn/async/base.py
new file mode 100644
index 00000000..08259bbf
--- /dev/null
+++ b/gunicorn/async/base.py
@@ -0,0 +1,126 @@
+# -*- coding: utf-8 -
+#
+# This file is part of gunicorn released under the MIT license. 
+# See the NOTICE for more information.
+
+import errno
+import os
+import select
+import socket
+import traceback
+
+from gunicorn import http
+from gunicorn.http.tee import UnexpectedEOF
+from gunicorn import util
+from gunicorn.worker import Worker
+
+ALREADY_HANDLED = object()
+
+class KeepaliveResponse(http.Response):
+
+    def default_headers(self):
+        if self.req.parser.should_close:
+            connection_hdr = "close"
+        else:
+            connection_hdr = "keep-alive"
+
+        return [
+            "HTTP/1.1 %s\r\n" % self.status,
+            "Server: %s\r\n" % self.SERVER_VERSION,
+            "Date: %s\r\n" % util.http_date(),
+            "Connection: %s\r\n" % connection_hdr
+        ]
+
+class KeepaliveRequest(http.Request):
+
+    def read(self):
+        ret = select.select([self._sock], [], [], self.conf.keepalive)
+        if not ret[0]:
+            return
+        try:
+            return super(KeepaliveRequest, self).read()
+        except socket.error, e:
+            if e[0] == 54:
+                return
+            raise
+
+class KeepaliveWorker(Worker):
+
+    def __init__(self, *args, **kwargs):
+        Worker.__init__(self, *args, **kwargs)
+        self.nb_connections = 0
+        self.worker_connections = self.conf.worker_connections
+
+    def handle(self, client, addr):
+         
+        self.nb_connections += 1
+        try:
+            self.init_sock(client)
+            while True:
+                req = KeepaliveRequest(client, addr, self.address, self.conf)
+                
+                try:
+                    environ = req.read()
+                    if not environ or not req.parser.headers:
+                        return
+                    response = self.app(environ, req.start_response)
+                    if response == ALREADY_HANDLED:
+                        break
+                except Exception, e:
+                    #Only send back traceback in HTTP in debug mode.
+                    if not self.debug:
+                        raise
+                    util.write_error(client, traceback.format_exc())
+                    break 
+                
+                KeepaliveResponse(client, response, req).send()
+                if req.parser.should_close:
+                    break
+        except socket.error, e:
+            if e[0] != errno.EPIPE:
+                self.log.exception("Error processing request.")
+            else:
+                self.log.warn("Ignoring EPIPE")
+        except UnexpectedEOF:
+            self.log.exception("remote closed the connection unexpectedly.")
+        except Exception, e:
+            self.log.exception("Error processing request.")
+            try:            
+                # Last ditch attempt to notify the client of an error.
+                mesg = "HTTP/1.0 500 Internal Server Error\r\n\r\n"
+                util.write_nonblock(client, mesg)
+            except:
+                pass
+            return
+        finally:
+            self.nb_connections -= 1 
+            util.close(client)
+
+    def run(self):
+        self.init_process()
+        self.socket.setblocking(0)
+
+        while self.alive:
+            self.notify()
+            
+            # If our parent changed then we shut down.
+            if self.ppid != os.getppid():
+                self.log.info("Parent changed, shutting down: %s" % self)
+                return
+                
+            if self.nb_connections > self.worker_connections:
+                continue
+                
+            try:
+                ret = select.select([self.socket], [], [], 1)
+                if ret[0]:
+                    self.accept()
+            except select.error, e:
+                if e[0] == errno.EINTR:
+                    continue
+                if e[0] == errno.EBADF:
+                    continue
+                raise
+            except KeyboardInterrupt :
+                return
+
diff --git a/gunicorn/async/eventlet_server.py b/gunicorn/async/eventlet_server.py
new file mode 100644
index 00000000..b619b253
--- /dev/null
+++ b/gunicorn/async/eventlet_server.py
@@ -0,0 +1,66 @@
+# -*- coding: utf-8 -
+#
+# This file is part of gunicorn released under the MIT license. 
+# See the NOTICE for more information.
+
+import errno
+
+import collections
+import eventlet
+from eventlet.green import os
+from eventlet.green import socket
+from eventlet import greenio
+from eventlet.hubs import trampoline
+
+from gunicorn import util
+from gunicorn import arbiter
+from gunicorn.async.base import KeepaliveWorker
+
+__original_GreenPipe__ = greenio.GreenPipe
+
+class _GreenPipe(__original_GreenPipe__):
+
+    def tell(self):
+        return self.fd.tell()
+
+    def seek(self, offset, whence=0):
+        fd = self.fd
+        self.read()
+        fd.seek(offset, whence)
+
+_eventlet_patched = None
+def patch_eventlet():
+    global _eventlet_patched
+    if _eventlet_patched:
+        return
+    greenio.GreenPipe = _GreenPipe
+    _eventlet_patched = True
+        
+class EventletWorker(KeepaliveWorker):
+
+    def init_process(self):
+        super(EventletWorker, self).init_process()
+        self.pool = eventlet.GreenPool(self.worker_connections)
+  
+    def accept(self):
+        try:
+            client, addr = self.socket.accept()
+            self.pool.spawn_n(self.handle, client, addr)
+        except socket.error, e:
+            if e[0] in (errno.EWOULDBLOCK, errno.EAGAIN):
+                return
+            raise
+
+
+class EventletArbiter(arbiter.Arbiter):
+
+    @classmethod
+    def setup(cls):
+        import eventlet
+        if eventlet.version_info < (0,9,7):
+            raise RuntimeError("You need eventlet >= 0.9.7")
+        patch_eventlet()
+        eventlet.monkey_patch(all=True)
+        
+    def init_worker(self, worker_age, pid, listener, app, timeout, conf):
+        return EventletWorker(worker_age, pid, listener, app, timeout, conf)
diff --git a/gunicorn/async/gevent_server.py b/gunicorn/async/gevent_server.py
new file mode 100644
index 00000000..41bc7377
--- /dev/null
+++ b/gunicorn/async/gevent_server.py
@@ -0,0 +1,44 @@
+# -*- coding: utf-8 -
+#
+# This file is part of gunicorn released under the MIT license. 
+# See the NOTICE for more information.
+
+
+import errno
+import os
+
+import gevent
+from gevent import socket
+from gevent.event import Event
+from gevent.greenlet import Greenlet
+from gevent.pool import Pool
+
+
+from gunicorn import arbiter
+from gunicorn import util
+from gunicorn.async.base import KeepaliveWorker
+
+class GEventWorker(KeepaliveWorker):
+            
+    def init_process(self):
+        super(GEventWorker, self).init_process()
+        self.pool = Pool(self.worker_connections)
+        #self.socket = socket.socket(_sock=self.socket)
+        
+    def accept(self):
+        try:
+            client, addr = self.socket.accept()
+            self.pool.spawn(self.handle, client, addr)
+        except socket.error, e:
+            if e[0] not in (errno.EAGAIN, errno.EWOULDBLOCK):
+                raise
+                         
+class GEventArbiter(arbiter.Arbiter):
+
+    @classmethod
+    def setup(cls):
+        from gevent import monkey
+        monkey.patch_all(thread=True,  ssl=True)
+    
+    def init_worker(self, worker_age, pid, listener, app, timeout, conf):
+        return GEventWorker(worker_age, pid, listener, app, timeout, conf)
diff --git a/gunicorn/config.py b/gunicorn/config.py
index 1bec3827..bfe38121 100644
--- a/gunicorn/config.py
+++ b/gunicorn/config.py
@@ -15,7 +15,7 @@ class Config(object):
     DEFAULT_CONFIG_FILE = 'gunicorn.conf.py'
     
     DEFAULTS = dict(
-            arbiter="egg:gunicorn",
+        arbiter="egg:gunicorn",
         backlog=2048,
         bind='127.0.0.1:8000',
         daemon=False,
diff --git a/gunicorn/http/__init__.py b/gunicorn/http/__init__.py
index dcbceff4..9a6f53bb 100644
--- a/gunicorn/http/__init__.py
+++ b/gunicorn/http/__init__.py
@@ -8,5 +8,3 @@ from gunicorn.http.request import Request, RequestError
 from gunicorn.http.response import Response
 
 __all__ = [Parser, Request, RequestError, Response]
-
-__version__ = '0.4'
\ No newline at end of file
diff --git a/gunicorn/http/response.py b/gunicorn/http/response.py
index 498f8e58..438b4593 100644
--- a/gunicorn/http/response.py
+++ b/gunicorn/http/response.py
@@ -3,7 +3,7 @@
 # This file is part of gunicorn released under the MIT license. 
 # See the NOTICE for more information.
 
-from gunicorn.util import  close, http_date, write, write_chunk
+from gunicorn.util import  http_date, write, write_chunk
 
 class Response(object):
     
@@ -16,14 +16,17 @@ class Response(object):
         self.SERVER_VERSION = req.SERVER_VERSION
         self.chunked = req.response_chunked
 
-    def send(self):
-        # send headers
-        resp_head = [
+    def default_headers(self):
+        return [
             "HTTP/1.1 %s\r\n" % self.status,
             "Server: %s\r\n" % self.SERVER_VERSION,
             "Date: %s\r\n" % http_date(),
             "Connection: close\r\n"
         ]
+
+    def send(self):
+        # send headers
+        resp_head = self.default_headers()
         resp_head.extend(["%s: %s\r\n" % (n, v) for n, v in self.headers])
         write(self._sock, "%s\r\n" % "".join(resp_head))
 
@@ -32,10 +35,8 @@ class Response(object):
             write(self._sock, chunk, self.chunked)
             
         if self.chunked:
-                # send last chunk
-                write_chunk(self._sock, "")
-
-        close(self._sock)
+            # send last chunk
+            write_chunk(self._sock, "")
 
         if hasattr(self.data, "close"):
             self.data.close()
diff --git a/gunicorn/worker.py b/gunicorn/worker.py
index 9cd393ba..414658bb 100644
--- a/gunicorn/worker.py
+++ b/gunicorn/worker.py
@@ -154,7 +154,11 @@ class Worker(object):
             req = http.Request(client, addr, self.address, self.conf)
 
             try:
-                response = self.app(req.read(), req.start_response)
+                environ = req.read()
+                if not environ or not req.parser.status:
+                    return
+
+                response = self.app(environ, req.start_response)
             except Exception, e:
                 # Only send back traceback in HTTP in debug mode.
                 if not self.debug:
@@ -180,4 +184,3 @@ class Worker(object):
                 pass
         finally:    
             util.close(client)
-            
diff --git a/setup.py b/setup.py
index 2fe84c4a..72cfaa14 100644
--- a/setup.py
+++ b/setup.py
@@ -50,7 +50,8 @@ setup(
 
     [gunicorn.arbiter]
     main=gunicorn.arbiter:Arbiter
-    
+    eventlet=gunicorn.async.eventlet_server:EventletArbiter
+    gevent=gunicorn.async.gevent_server:GEventArbiter 
     
     [paste.server_runner]
     main=gunicorn.main:paste_server