Fix acceptance tests with latest flask and werkzeug

[PaulBrandUWV]

Fix acceptance tests with latest flask and werkzeug.
The local test http server based on flask and werkzeug was not working with the latest versions. This PR fixes that.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.06%. Comparing base (533c31c) to head (9ad22d5).
Report is 5 commits behind head on master.

❗ Current head 9ad22d5 differs from pull request most recent head e5d0561. Consider uploading reports for the commit e5d0561 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #391      +/-   ##
==========================================
+ Coverage   86.00%   86.06%   +0.06%     
==========================================
  Files           9        9              
  Lines         450      452       +2     
  Branches      108      108              
==========================================
+ Hits          387      389       +2     
  Misses         57       57              
  Partials        6        6              

Flag	Coverage Δ
acceptance	82.30% <ø> (+0.31%)	⬆️
unit	59.73% <ø> (+0.17%)	⬆️

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[lucagiove]

So this will work only for later python versions?

[PaulBrandUWV]

So this will work only for later python versions?

It's no so much related to the python version. This works with werkzeug version 3 and up. Before is werkzeug 2.x was used.