Fix exchange_code_for_access_token.

.gitignore

@@ -2,5 +2,5 @@
 .DS_Store
 *.swp
 test_settings.py
-
+.idea
 build

instagram/models.py

@@ -205,6 +205,11 @@ def __init__(self, id, *args, **kwargs):
     def __unicode__(self):
         return "User: %s" % self.username
 
+    def __eq__(self, other):
+        return self.id == other.id
+
+    def __ne__(self, other):
+        return not self == other
 
 class Relationship(ApiModel):
 

instagram/oauth2.py

@@ -109,7 +109,8 @@ def exchange_for_access_token(self, code=None, username=None, password=None, sco
         data = self._data_for_exchange(code, username, password, scope=scope, user_id=user_id)
         http_object = Http(disable_ssl_certificate_validation=True)
         url = self.api.access_token_url
-        response, content = http_object.request(url, method="POST", body=data)
+        headers = {'Content-Type': 'application/x-www-form-urlencoded'}
+        response, content = http_object.request(url, method="POST", headers=headers, body=data)
         parsed_content = simplejson.loads(content.decode())
         if int(response['status']) != 200:
             raise OAuth2AuthExchangeError(parsed_content.get("error_message", ""))