Begin working on asyncio port.

discord/errors.py

@@ -24,11 +24,6 @@ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.
 """
 
-try:
-    import http.client as httplib
-except ImportError:
-    import httplib
-
 class DiscordException(Exception):
     """Base exception class for discord.py
 
@@ -56,28 +51,19 @@ class HTTPException(DiscordException):
     .. attribute:: response
 
         The response of the failed HTTP request. This is an
-        instance of `requests.Response`__.
+        instance of `aiohttp.ClientResponse`__.
 
-        __ http://docs.python-requests.org/en/latest/api/#requests.Response
+        __ http://aiohttp.readthedocs.org/en/stable/client_reference.html#aiohttp.ClientResponse
     """
 
     def __init__(self, response, message=None):
         self.response = response
 
-        if message is None:
-            message = httplib.responses.get(response.status_code, 'HTTP error')
+        fmt = '{0.reason} (status code: {0.status})'
+        if message:
+            fmt = fmt + ': {1}'
 
-        message = '{0} (status code: {1.response.status_code})'.format(message, self)
-
-        try:
-            data = response.json()
-            response_error = data['message']
-            if response_error:
-                message = '{}: {}'.format(message, response_error)
-        except:
-            pass
-
-        super(HTTPException, self).__init__(message)
+        super().__init__(fmt.format(self.response, message))
 
 class InvalidArgument(ClientException):
     """Exception that's thrown when an argument to a function