--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/site-content/proposals/2009/08/07/proxy.py	Sun Aug 09 12:40:14 2009 +0530
@@ -0,0 +1,93 @@
+# urllib2 opener to connection through a proxy using the CONNECT method, (useful for SSL)
+# tested with python 2.4
+
+import urllib2
+import urllib
+import httplib
+import socket
+
+
+class ProxyHTTPConnection(httplib.HTTPConnection):
+
+    _ports = {'http' : 80, 'https' : 443}
+
+
+    def request(self, method, url, body=None, headers={}):
+        #request is called before connect, so can interpret url and get
+        #real host/port to be used to make CONNECT request to proxy
+        proto, rest = urllib.splittype(url)
+        if proto is None:
+            raise ValueError, "unknown URL type: %s" % url
+        #get host
+        host, rest = urllib.splithost(rest)
+        #try to get port
+        host, port = urllib.splitport(host)
+        #if port is not defined try to get from proto
+        if port is None:
+            try:
+                port = self._ports[proto]
+            except KeyError:
+                raise ValueError, "unknown protocol for: %s" % url
+        self._real_host = host
+        self._real_port = port
+        httplib.HTTPConnection.request(self, method, url, body, headers)
+        
+
+    def connect(self):
+        httplib.HTTPConnection.connect(self)
+        #send proxy CONNECT request
+        self.send("CONNECT %s:%d HTTP/1.0\r\n\r\n" % (self._real_host, self._real_port))
+        #expect a HTTP/1.0 200 Connection established
+        response = self.response_class(self.sock, strict=self.strict, method=self._method)
+        (version, code, message) = response._read_status()
+        #probably here we can handle auth requests...
+        if code != 200:
+            #proxy returned and error, abort connection, and raise exception
+            self.close()
+            raise socket.error, "Proxy connection failed: %d %s" % (code, message.strip())
+        #eat up header block from proxy....
+        while True:
+            #should not use directly fp probablu
+            line = response.fp.readline()
+            if line == '\r\n': break
+
+
+class ProxyHTTPSConnection(ProxyHTTPConnection):
+    
+    default_port = 443
+
+    def __init__(self, host, port = None, key_file = None, cert_file = None, strict = None):
+        ProxyHTTPConnection.__init__(self, host, port)
+        self.key_file = key_file
+        self.cert_file = cert_file
+    
+    def connect(self):
+        ProxyHTTPConnection.connect(self)
+        #make the sock ssl-aware
+        ssl = socket.ssl(self.sock, self.key_file, self.cert_file)
+        self.sock = httplib.FakeSocket(self.sock, ssl)
+        
+                                       
+class ConnectHTTPHandler(urllib2.HTTPHandler):
+
+    def do_open(self, http_class, req):
+        return urllib2.HTTPHandler.do_open(self, ProxyHTTPConnection, req)
+
+
+class ConnectHTTPSHandler(urllib2.HTTPSHandler):
+
+    def do_open(self, http_class, req):
+        return urllib2.HTTPSHandler.do_open(self, ProxyHTTPSConnection, req)
+
+
+if __name__ == '__main__':
+    
+    import sys
+    
+    opener = urllib2.build_opener(ConnectHTTPHandler, ConnectHTTPSHandler)
+    urllib2.install_opener(opener)
+    req = urllib2.Request(url='http://google.com')
+    req.set_proxy('10.101.1.1:80', 'http')
+    f = urllib2.urlopen(req)
+    print f.read()
+