Under which category would you file this issue?

Providers

Apache Airflow version

3.2.0

What happened and how to reproduce it?

upgrade Airflow to the latest version and can't see the login screen after refresh the login page.
Installation was done on python 3.12

The logs from airflow-webserver
`
Apr 08 16:05:14 grafana-sandbox airflow[902886]: Traceback (most recent call last):
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 2529, in wsgi_app
Apr 08 16:05:14 grafana-sandbox airflow[902886]: response = self.full_dispatch_request()
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 1826, in full_dispatch_request
Apr 08 16:05:14 grafana-sandbox airflow[902886]: return self.finalize_request(rv)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 1847, in finalize_request
Apr 08 16:05:14 grafana-sandbox airflow[902886]: response = self.process_response(response)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 2344, in process_response
Apr 08 16:05:14 grafana-sandbox airflow[902886]: self.session_interface.save_session(self, ctx.session, response)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/airflow/providers/fab/www/session.py", line 53, in save_session
Apr 08 16:05:14 grafana-sandbox airflow[902886]: return super().save_session(*args, **kwargs)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/sessions.py", line 411, in save_session
Apr 08 16:05:14 grafana-sandbox airflow[902886]: response.set_cookie(
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/sansio/response.py", line 232, in set_cookie
Apr 08 16:05:14 grafana-sandbox airflow[902886]: dump_cookie(
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/http.py", line 1373, in dump_cookie
Apr 08 16:05:14 grafana-sandbox airflow[902886]: if not _cookie_no_quote_re.fullmatch(value):
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: TypeError: cannot use a string pattern on a bytes-like object
Apr 08 16:05:14 grafana-sandbox airflow[902886]: 2026-04-08T20:05:14.198141Z [error ] Request finalizing failed with an error while handling an error [airflow.providers.fab.www.app] loc=app.py:1852
Apr 08 16:05:14 grafana-sandbox airflow[902886]: Traceback (most recent call last):
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 2529, in wsgi_app
Apr 08 16:05:14 grafana-sandbox airflow[902886]: response = self.full_dispatch_request()
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 1826, in full_dispatch_request
Apr 08 16:05:14 grafana-sandbox airflow[902886]: return self.finalize_request(rv)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 1847, in finalize_request
Apr 08 16:05:14 grafana-sandbox airflow[902886]: response = self.process_response(response)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 2344, in process_response
Apr 08 16:05:14 grafana-sandbox airflow[902886]: self.session_interface.save_session(self, ctx.session, response)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/airflow/providers/fab/www/session.py", line 53, in save_session
Apr 08 16:05:14 grafana-sandbox airflow[902886]: return super().save_session(*args, **kwargs)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/sessions.py", line 411, in save_session
Apr 08 16:05:14 grafana-sandbox airflow[902886]: response.set_cookie(
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/sansio/response.py", line 232, in set_cookie
Apr 08 16:05:14 grafana-sandbox airflow[902886]: dump_cookie(
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/http.py", line 1373, in dump_cookie
Apr 08 16:05:14 grafana-sandbox airflow[902886]: if not _cookie_no_quote_re.fullmatch(value):
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: TypeError: cannot use a string pattern on a bytes-like object
Apr 08 16:05:14 grafana-sandbox airflow[902886]: During handling of the above exception, another exception occurred:
Apr 08 16:05:14 grafana-sandbox airflow[902886]: Traceback (most recent call last):
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 1847, in finalize_request
Apr 08 16:05:14 grafana-sandbox airflow[902886]: response = self.process_response(response)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 2344, in process_response
Apr 08 16:05:14 grafana-sandbox airflow[902886]: self.session_interface.save_session(self, ctx.session, response)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/airflow/providers/fab/www/session.py", line 53, in save_session
Apr 08 16:05:14 grafana-sandbox airflow[902886]: return super().save_session(*args, **kwargs)
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/sessions.py", line 411, in save_session
Apr 08 16:05:14 grafana-sandbox airflow[902886]: response.set_cookie(
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/sansio/response.py", line 232, in set_cookie
Apr 08 16:05:14 grafana-sandbox airflow[902886]: dump_cookie(
Apr 08 16:05:14 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/http.py", line 1373, in dump_cookie
Apr 08 16:05:14 grafana-sandbox airflow[902886]: if not _cookie_no_quote_re.fullmatch(value):
Apr 08 16:05:14 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:05:14 grafana-sandbox airflow[902886]: TypeError: cannot use a string pattern on a bytes-like object
Apr 08 16:05:14 grafana-sandbox airflow[902886]: 2026-04-08T20:05:14.200423Z [info ] request finished [http.access] client_addr=10.250.10.108:49230 duration_us=7844 loc=http_access_log.py:98 method=GET path=/auth/login/ query='next=http%3A%2F%2F172.20.81.200%3A8088%2F' status_code=500
Apr 08 16:05:14 grafana-sandbox airflow[902886]: 2026-04-08T20:05:14.395195Z [info ] request finished [http.access] client_addr=10.250.10.108:49230 duration_us=1682 loc=http_access_log.py:98 method=GET path=/favicon.ico query= status_code=200
Apr 08 16:06:15 grafana-sandbox airflow[902886]: 2026-04-08T20:06:15.336171Z [error ] Exception on /login/ [GET] [airflow.providers.fab.www.app] loc=app.py:1744
Apr 08 16:06:15 grafana-sandbox airflow[902886]: Traceback (most recent call last):
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 2529, in wsgi_app
Apr 08 16:06:15 grafana-sandbox airflow[902886]: response = self.full_dispatch_request()
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 1826, in full_dispatch_request
Apr 08 16:06:15 grafana-sandbox airflow[902886]: return self.finalize_request(rv)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 1847, in finalize_request
Apr 08 16:06:15 grafana-sandbox airflow[902886]: response = self.process_response(response)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 2344, in process_response
Apr 08 16:06:15 grafana-sandbox airflow[902886]: self.session_interface.save_session(self, ctx.session, response)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/airflow/providers/fab/www/session.py", line 53, in save_session
Apr 08 16:06:15 grafana-sandbox airflow[902886]: return super().save_session(*args, **kwargs)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/sessions.py", line 411, in save_session
Apr 08 16:06:15 grafana-sandbox airflow[902886]: response.set_cookie(
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/sansio/response.py", line 232, in set_cookie
Apr 08 16:06:15 grafana-sandbox airflow[902886]: dump_cookie(
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/http.py", line 1373, in dump_cookie
Apr 08 16:06:15 grafana-sandbox airflow[902886]: if not _cookie_no_quote_re.fullmatch(value):
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: TypeError: cannot use a string pattern on a bytes-like object
Apr 08 16:06:15 grafana-sandbox airflow[902886]: 2026-04-08T20:06:15.337481Z [error ] Request finalizing failed with an error while handling an error [airflow.providers.fab.www.app] loc=app.py:1852
Apr 08 16:06:15 grafana-sandbox airflow[902886]: Traceback (most recent call last):
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 2529, in wsgi_app
Apr 08 16:06:15 grafana-sandbox airflow[902886]: response = self.full_dispatch_request()
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 1826, in full_dispatch_request
Apr 08 16:06:15 grafana-sandbox airflow[902886]: return self.finalize_request(rv)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 1847, in finalize_request
Apr 08 16:06:15 grafana-sandbox airflow[902886]: response = self.process_response(response)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 2344, in process_response
Apr 08 16:06:15 grafana-sandbox airflow[902886]: self.session_interface.save_session(self, ctx.session, response)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/airflow/providers/fab/www/session.py", line 53, in save_session
Apr 08 16:06:15 grafana-sandbox airflow[902886]: return super().save_session(*args, **kwargs)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/sessions.py", line 411, in save_session
Apr 08 16:06:15 grafana-sandbox airflow[902886]: response.set_cookie(
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/sansio/response.py", line 232, in set_cookie
Apr 08 16:06:15 grafana-sandbox airflow[902886]: dump_cookie(
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/http.py", line 1373, in dump_cookie
Apr 08 16:06:15 grafana-sandbox airflow[902886]: if not _cookie_no_quote_re.fullmatch(value):
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: TypeError: cannot use a string pattern on a bytes-like object
Apr 08 16:06:15 grafana-sandbox airflow[902886]: During handling of the above exception, another exception occurred:
Apr 08 16:06:15 grafana-sandbox airflow[902886]: Traceback (most recent call last):
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 1847, in finalize_request
Apr 08 16:06:15 grafana-sandbox airflow[902886]: response = self.process_response(response)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/app.py", line 2344, in process_response
Apr 08 16:06:15 grafana-sandbox airflow[902886]: self.session_interface.save_session(self, ctx.session, response)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/airflow/providers/fab/www/session.py", line 53, in save_session
Apr 08 16:06:15 grafana-sandbox airflow[902886]: return super().save_session(*args, **kwargs)
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/flask/sessions.py", line 411, in save_session
Apr 08 16:06:15 grafana-sandbox airflow[902886]: response.set_cookie(
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/sansio/response.py", line 232, in set_cookie
Apr 08 16:06:15 grafana-sandbox airflow[902886]: dump_cookie(
Apr 08 16:06:15 grafana-sandbox airflow[902886]: File "/u01/users/airflow/.env/lib64/python3.12/site-packages/werkzeug/http.py", line 1373, in dump_cookie
Apr 08 16:06:15 grafana-sandbox airflow[902886]: if not _cookie_no_quote_re.fullmatch(value):
Apr 08 16:06:15 grafana-sandbox airflow[902886]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apr 08 16:06:15 grafana-sandbox airflow[902886]: TypeError: cannot use a string pattern on a bytes-like object

`

What you think should happen instead?

No response

Operating System

RHEL 9

Deployment

Virtualenv installation

Apache Airflow Provider(s)

fab

Versions of Apache Airflow Providers

apache-airflow-providers-fab-3.6.0

Official Helm Chart version

Not Applicable

Kubernetes Version

No response

Helm Chart configuration

No response

Docker Image customizations

No response

Anything else?

This problem occurs every time when I try refresh the page.
The airflow.cfg was not touched from previous 3.1 installation.

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct