gistfile1.diff

261,262c261,262
<             # Except the ``url``. Requests on Py3 *really* wants that to be a
<             # string, not bytes.
---
>             # Except the ``url`` and ``headers``. Requests on Py3 *really*
>             # wants those to be strings, not bytes.
264c264
<             bytes_headers = {}
---
>             _headers = {}
269c269
<             if headers is not None:
---
>             if headers is not None and not IS_PY3:
271c271,273
<                     bytes_headers[force_bytes(k)] = force_bytes(v)
---
>                     _headers[force_bytes(k)] = force_bytes(v)
>             else:
>                 _headers = headers
273c275
<             resp = requests_method(url, data=bytes_body, headers=bytes_headers, files=files,
---
>             resp = requests_method(url, data=bytes_body, headers=_headers, files=files,