Try to process response data after checking errors, not before. Add 413 File too large http error message.

telegram/utils/request.py

@@ -183,22 +183,24 @@ class Request(object):
             # 200-299 range are HTTP success statuses
             return resp.data
 
-        try:
-            message = self._parse(resp.data)
-        except ValueError:
-            raise NetworkError('Unknown HTTPError {0}'.format(resp.status))
-
         if resp.status in (401, 403):
             raise Unauthorized(message)
         elif resp.status == 400:
             raise BadRequest(message)
         elif resp.status == 404:
             raise InvalidToken()
+        elif resp.status == 413:
+            raise NetworkError('File too large. Check telegram api limits https://core.telegram.org/bots/api#senddocument')
         elif resp.status == 502:
             raise NetworkError('Bad Gateway')
         else:
             raise NetworkError('{0} ({1})'.format(message, resp.status))
 
+        try:
+            message = self._parse(resp.data)
+        except ValueError:
+            raise NetworkError('Unknown HTTPError {0}'.format(resp.status))
+
     def get(self, url, timeout=None):
         """Request an URL.