After the fix introduced in https://review.openstack.org/#/c/505764/ the keystoneauth cause TypeError: unorderable types: bytes() < str() for some requests executed by python-glanceclient e.g. when one tries to get the Glance task by id using SessionClient.
It is turned out that python-glanceclient encodes all the default headers before passing it to keystoneauth. The encoding is applied due to:
```
# NOTE(pumaranikar): To avoid bug #1641239, no modification of
# headers should be allowed after encode_headers() is called.
```
See https://github.com/openstack/python-glanceclient/blob/28c003dc1179ddb3124fd30c6f525dd341ae9213/glanceclient/common/http.py
While processing the request keystoneauth adds it's own headers (e.g. auth token and User-Agent) but doesn't encode or decode anything. As a result, we have a list of headers, some of which are plain strings while others are bytes.
Since v3.5.0 of keystoneauth all the received headers are sorted in _http_log_request (keystoneauth/keystoneauth1/session.py):
```
if headers:
# Sort headers so that testing can work consistently.
for header in sorted(headers.items()):
string_parts.append('-H "%s: %s"'
% self._process_header(header))
```
The attempt to sort the headers cause TypeError: unorderable types: bytes() < str().
For additional info:
The headers provided by python-glanceclient (token is replaced by a dummy):
```
dict_items(
```
The received traceback:
```
Traceback (most recent call last):
File "/usr/libexec/
return RequestIdProxy(
File "/usr/libexec/
resp, body = self.http_
File "/usr/libexec/
return self.request(url, 'GET', **kwargs)
File "/usr/libexec/
**kwargs)
File "/usr/libexec/
return self.session.
File "/usr/libexec/
logger=logger, split_loggers=
File "/usr/libexec/
for header in sorted(
TypeError: unorderable types: bytes() < str()
```