Do not send gzip header for streaming calls

Twitter is moving all of its APIs towards HTTP1.1.
https://dev.twitter.com/blog/deprecating-http-1.0-streaming-api
Userstream passed already mid-november and has been borken for this lib since
On Jan 6, Twitter will apply it as weel for all the other stream methods,
meaning they probably would be all broken.

The problem was in two pieces.
First with this commit, we stop asking for gzip encoded data for streaming
calls: for the HTPP1.0 calls, this was not taken into account anyway, but with
HTTP1.1 the answer is now chunked and should therefore not caught zipped.

(First part of fix for userstream and soon all streams cf python-twitter-tools#190 python-twitter-tools#116)

twitter/api.py

@@ -128,7 +128,7 @@ class TwitterCall(object):
 
     def __init__(
         self, auth, format, domain, callable_cls, uri="",
-        uriparts=None, secure=True, timeout=None):
+        uriparts=None, secure=True, timeout=None, gzip=False):
         self.auth = auth
         self.format = format
         self.domain = domain
@@ -137,6 +137,7 @@ def __init__(
         self.uriparts = uriparts
         self.secure = secure
         self.timeout = timeout
+        self.gzip = gzip
 
     def __getattr__(self, k):
         try:
@@ -147,7 +148,7 @@ def extend_call(arg):
                     auth=self.auth, format=self.format, domain=self.domain,
                     callable_cls=self.callable_cls, timeout=self.timeout, uriparts=self.uriparts \
                         + (arg,),
-                    secure=self.secure)
+                    secure=self.secure, gzip=self.gzip)
             if k == "_":
                 return extend_call
             else:
@@ -194,7 +195,9 @@ def __call__(self, **kwargs):
         uriBase = "http%s://%s/%s%s%s" %(
                     secure_str, self.domain, uri, dot, self.format)
 
-        headers = {'Accept-Encoding': 'gzip'}
+        headers = {}
+        if self.gzip:
+            headers['Accept-Encoding'] = 'gzip'
         if self.auth:
             headers.update(self.auth.generate_headers())
             arg_data = self.auth.encode_params(uriBase, method, kwargs)

twitter/stream.py

@@ -119,4 +119,4 @@ def __init__(
         TwitterStreamCall.__init__(
             self, auth=auth, format="json", domain=domain,
             callable_cls=call_cls,
-            secure=secure, uriparts=uriparts, timeout=timeout)
+            secure=secure, uriparts=uriparts, timeout=timeout, gzip=False)