diff --git a/httplib2/__init__.py b/httplib2/__init__.py
index 158e967..bbf6f79 100644
--- a/httplib2/__init__.py
+++ b/httplib2/__init__.py
@@ -147,6 +147,7 @@
 class ProxiesUnavailableError(HttpLib2Error): pass
 class CertificateValidationUnsupported(HttpLib2Error): pass
 class SSLHandshakeError(HttpLib2Error): pass
+class NotSupportedOnThisPlatform(HttpLib2Error): pass
 class CertificateHostnameMismatch(SSLHandshakeError):
   def __init__(self, desc, host, cert):
     HttpLib2Error.__init__(self, desc)
@@ -529,6 +530,8 @@
                 self.challenge['nc'],
                 self.challenge['cnonce'],
                 )
+        if self.challenge.get('opaque'):
+            headers['authorization'] += ', opaque="%s"' % self.challenge['opaque']
         self.challenge['nc'] += 1
 
     def response(self, response, content):
@@ -866,7 +869,7 @@
             host_re = host.replace('.', '\.').replace('*', '[^.]*')
             if re.search('^%s$' % (host_re,), hostname, re.I):
                 return True
-            return False
+        return False
 
     def connect(self):
         "Connect to a host on a given (SSL) port."
@@ -976,7 +979,8 @@
             deadline=self.timeout,
             validate_certificate=self.validate_certificate)
         self.response = ResponseDict(response.headers)
-        self.response['status'] = response.status_code
+        self.response['status'] = str(response.status_code)
+        self.response.status = response.status_code
         setattr(self.response, 'read', lambda : response.content)
 
       # Make sure the exceptions raised match the exceptions expected.
diff --git a/httplib2/cacerts.txt b/httplib2/cacerts.txt
index e65f21d..da36ed1 100644
--- a/httplib2/cacerts.txt
+++ b/httplib2/cacerts.txt
@@ -631,3 +631,84 @@
 95K+8cPV1ZVqBLssziY2ZcgxxufuP+NXdYR6Ee9GTxj005i7qIcyunL2POI9n9cd
 2cNgQ4xYDiKWL2KjLB+6rQXvqzJ4h6BUcxm1XAX5Uj5tLUUL9wqT6u0G+bI=
 -----END CERTIFICATE-----
+
+Go Daddy Certification Authority Root Certificate Bundle
+========================================================
+
+-----BEGIN CERTIFICATE-----
+MIIE3jCCA8agAwIBAgICAwEwDQYJKoZIhvcNAQEFBQAwYzELMAkGA1UEBhMCVVMx
+ITAfBgNVBAoTGFRoZSBHbyBEYWRkeSBHcm91cCwgSW5jLjExMC8GA1UECxMoR28g
+RGFkZHkgQ2xhc3MgMiBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTAeFw0wNjExMTYw
+MTU0MzdaFw0yNjExMTYwMTU0MzdaMIHKMQswCQYDVQQGEwJVUzEQMA4GA1UECBMH
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+YXRpb24gQXV0aG9yaXR5MREwDwYDVQQFEwgwNzk2OTI4NzCCASIwDQYJKoZIhvcN
+AQEBBQADggEPADCCAQoCggEBAMQt1RWMnCZM7DI161+4WQFapmGBWTtwY6vj3D3H
+KrjJM9N55DrtPDAjhI6zMBS2sofDPZVUBJ7fmd0LJR4h3mUpfjWoqVTr9vcyOdQm
+VZWt7/v+WIbXnvQAjYwqDL1CBM6nPwT27oDyqu9SoWlm2r4arV3aLGbqGmu75RpR
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+MB0GA1UdDgQWBBT9rGEyk2xF1uLuhV+auud2mWjM5zAfBgNVHSMEGDAWgBTSxLDS
+kdRMEXGzYcs9of7dqGrU4zASBgNVHRMBAf8ECDAGAQH/AgEAMDMGCCsGAQUFBwEB
+BCcwJTAjBggrBgEFBQcwAYYXaHR0cDovL29jc3AuZ29kYWRkeS5jb20wRgYDVR0f
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+BgNVHQ8BAf8EBAMCAQYwDQYJKoZIhvcNAQEFBQADggEBANKGwOy9+aG2Z+5mC6IG
+OgRQjhVyrEp0lVPLN8tESe8HkGsz2ZbwlFalEzAFPIUyIXvJxwqoJKSQ3kbTJSMU
+A2fCENZvD117esyfxVgqwcSeIaha86ykRvOe5GPLL5CkKSkB2XIsKd83ASe8T+5o
+0yGPwLPk9Qnt0hCqU7S+8MxZC9Y7lhyVJEnfzuz9p0iRFEUOOjZv2kWzRaJBydTX
+RE4+uXR21aITVSzGh6O1mawGhId/dQb8vxRMDsxuxN89txJx9OjxUUAiKEngHUuH
+qDTMBqLdElrRhjZkAzVvb3du6/KFUJheqwNTrZEjYx8WnM25sgVjOuH0aBsXBTWV
+U+4=
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIE+zCCBGSgAwIBAgICAQ0wDQYJKoZIhvcNAQEFBQAwgbsxJDAiBgNVBAcTG1Zh
+bGlDZXJ0IFZhbGlkYXRpb24gTmV0d29yazEXMBUGA1UEChMOVmFsaUNlcnQsIElu
+Yy4xNTAzBgNVBAsTLFZhbGlDZXJ0IENsYXNzIDIgUG9saWN5IFZhbGlkYXRpb24g
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+DTI0MDYyOTE3MDYyMFowYzELMAkGA1UEBhMCVVMxITAfBgNVBAoTGFRoZSBHbyBE
+YWRkeSBHcm91cCwgSW5jLjExMC8GA1UECxMoR28gRGFkZHkgQ2xhc3MgMiBDZXJ0
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+N1j3hybX2C32qRe3H3I2TqYXP2WYktsqbl2i/ojgC95/5Y0V4evLOtXiEqITLdiO
+r18SPaAIBQi2XKVlOARFmR6jYGB0xUGlcmIbYsUfb18aQr4CUWWoriMYavx4A6lN
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+MB4GCSqGSIb3DQEJARYRaW5mb0B2YWxpY2VydC5jb22CAQEwDwYDVR0TAQH/BAUw
+AwEB/zAzBggrBgEFBQcBAQQnMCUwIwYIKwYBBQUHMAGGF2h0dHA6Ly9vY3NwLmdv
+ZGFkZHkuY29tMEQGA1UdHwQ9MDswOaA3oDWGM2h0dHA6Ly9jZXJ0aWZpY2F0ZXMu
+Z29kYWRkeS5jb20vcmVwb3NpdG9yeS9yb290LmNybDBLBgNVHSAERDBCMEAGBFUd
+IAAwODA2BggrBgEFBQcCARYqaHR0cDovL2NlcnRpZmljYXRlcy5nb2RhZGR5LmNv
+bS9yZXBvc2l0b3J5MA4GA1UdDwEB/wQEAwIBBjANBgkqhkiG9w0BAQUFAAOBgQC1
+QPmnHfbq/qQaQlpE9xXUhUaJwL6e4+PrxeNYiY+Sn1eocSxI0YGyeR+sBjUZsE4O
+WBsUs5iB0QQeyAfJg594RAoYC5jcdnplDQ1tgMQLARzLrUc+cb53S8wGd9D0Vmsf
+SxOaFIqII6hR8INMqzW/Rn453HWkrugp++85j09VZw==
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIC5zCCAlACAQEwDQYJKoZIhvcNAQEFBQAwgbsxJDAiBgNVBAcTG1ZhbGlDZXJ0
+IFZhbGlkYXRpb24gTmV0d29yazEXMBUGA1UEChMOVmFsaUNlcnQsIEluYy4xNTAz
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+IYEZoDJJKPTEjlbVUjP9UNV+mWwD5MlM/Mtsq2azSiGM5bUMMj4QssxsodyamEwC
+W/POuZ6lcg5Ktz885hZo+L7tdEy8W9ViH0Pd
+-----END CERTIFICATE-----
+
diff --git a/httplib2/socks.py b/httplib2/socks.py
index a458e1c..84cb93b 100644
--- a/httplib2/socks.py
+++ b/httplib2/socks.py
@@ -40,6 +40,7 @@
 
 """
 
+import base64
 import socket
 import struct
 import sys
@@ -50,6 +51,7 @@
 PROXY_TYPE_SOCKS4 = 1
 PROXY_TYPE_SOCKS5 = 2
 PROXY_TYPE_HTTP = 3
+PROXY_TYPE_HTTP_NO_TUNNEL = 4
 
 _defaultproxy = None
 _orgsocket = socket.socket
@@ -126,6 +128,7 @@
             self.__proxy = (None, None, None, None, None, None)
         self.__proxysockname = None
         self.__proxypeername = None
+        self.__httptunnel = True
 
     def __recvall(self, count):
         """__recvall(count) -> data
@@ -139,6 +142,41 @@
             data = data + d
         return data
 
+    def sendall(self, content, *args):
+        """ override socket.socket.sendall method to rewrite the header 
+        for non-tunneling proxies if needed 
+        """
+        if not self.__httptunnel:
+            content = self.__rewriteproxy(content)
+        return super(socksocket, self).sendall(content, *args)
+
+    def __rewriteproxy(self, header):
+        """ rewrite HTTP request headers to support non-tunneling proxies 
+        (i.e. those which do not support the CONNECT method).
+        This only works for HTTP (not HTTPS) since HTTPS requires tunneling.
+        """
+        host, endpt = None, None
+        hdrs = header.split("\r\n")
+        for hdr in hdrs:
+            if hdr.lower().startswith("host:"):
+                host = hdr
+            elif hdr.lower().startswith("get") or hdr.lower().startswith("post"):
+                endpt = hdr
+        if host and endpt: 
+            hdrs.remove(host)
+            hdrs.remove(endpt)
+            host = host.split(" ")[1]
+            endpt = endpt.split(" ")
+            if (self.__proxy[4] != None and self.__proxy[5] != None):
+                hdrs.insert(0, self.__getauthheader())
+            hdrs.insert(0, "Host: %s" % host)
+            hdrs.insert(0, "%s http://%s%s %s" % (endpt[0], host, endpt[1], endpt[2]))
+        return "\r\n".join(hdrs)
+
+    def __getauthheader(self):
+        auth = self.__proxy[4] + ":" + self.__proxy[5]
+        return "Proxy-Authorization: Basic " + base64.b64encode(auth)
+
     def setproxy(self, proxytype=None, addr=None, port=None, rdns=True, username=None, password=None):
         """setproxy(proxytype, addr[, port[, rdns[, username[, password]]]])
         Sets the proxy to be used.
@@ -326,7 +364,12 @@
             addr = socket.gethostbyname(destaddr)
         else:
             addr = destaddr
-        self.sendall(("CONNECT " + addr + ":" + str(destport) + " HTTP/1.1\r\n" + "Host: " + destaddr + "\r\n\r\n").encode())
+        headers =  ["CONNECT ", addr, ":", str(destport), " HTTP/1.1\r\n"]
+        headers += ["Host: ", destaddr, "\r\n"]
+        if (self.__proxy[4] != None and self.__proxy[5] != None):
+                headers += [self.__getauthheader(), "\r\n"]
+        headers.append("\r\n")
+        self.sendall("".join(headers).encode())
         # We read the response until we get the string "\r\n\r\n"
         resp = self.recv(1)
         while resp.find("\r\n\r\n".encode()) == -1:
@@ -379,6 +422,16 @@
                 portnum = 8080
             _orgsocket.connect(self,(self.__proxy[1], portnum))
             self.__negotiatehttp(destpair[0], destpair[1])
+        elif self.__proxy[0] == PROXY_TYPE_HTTP_NO_TUNNEL:
+            if self.__proxy[2] != None:
+                portnum = self.__proxy[2]
+            else:
+                portnum = 8080
+            _orgsocket.connect(self,(self.__proxy[1],portnum))
+            if destpair[1] == 443:
+                self.__negotiatehttp(destpair[0],destpair[1])
+            else:
+                self.__httptunnel = False
         elif self.__proxy[0] == None:
             _orgsocket.connect(self, (destpair[0], destpair[1]))
         else: