[Fixes #14244] Do not return WWW-Authenticate inside API exception response

[giohappy]

Checklist

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[gemini-code-assist]

Code Review

This pull request modifies the custom exception handler to remove the 'WWW-Authenticate' header from 401 Unauthorized responses. However, calling .pop() on response.headers will raise an AttributeError because HttpHeaders in Django is not a mutable mapping. It is recommended to safely remove the header using the del operator on the response object directly.

[gemini-code-assist]

In Django, response.headers returns an instance of HttpHeaders which inherits from CaseInsensitiveMapping (a subclass of collections.abc.Mapping, not MutableMapping). Because of this, it does not implement the pop() method, and calling response.headers.pop('WWW-Authenticate', None) will raise an AttributeError: 'HttpHeaders' object has no attribute 'pop'.

To safely and compatibly remove the header in Django, use the standard response.has_header() check and the del operator on the response object directly.

Suggested change

	if response.status_code == 401:
	response.headers.pop('WWW-Authenticate', None)
	if response.status_code == 401 and response.has_header('WWW-Authenticate'):
	del response['WWW-Authenticate']

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.93%. Comparing base (91c4ec5) to head (e895079).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #14265   +/-   ##
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  Coverage   74.92%   74.93%           
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  Files         975      975           
  Lines       59902    59912   +10     
  Branches     8157     8159    +2     
=======================================
+ Hits        44884    44894   +10     
  Misses      13194    13194           
  Partials     1824     1824           

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