Fix proxy_set_header for websocket and custom override locations

[mesudip]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces a ProxyHeaderProcessor to manage the reinsertion of default proxy headers when custom headers are injected or for websocket locations. It also updates the Jinja2 template to conditionally render these headers and adds comprehensive unit tests. The review feedback highlights a fragile type check in ProxyHeaderProcessor where checking for list instead of str can break other iterable types. Additionally, it suggests simplifying both the Python logic and the Jinja2 template by treating all websocket locations as requiring header reinsertion, which would eliminate redundant hardcoded blocks in the template.

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[codecov]

Codecov Report

❌ Patch coverage is 95.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.61%. Comparing base (c8c60b0) to head (aff3d9e).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...nx_proxy/post_processors/proxy_header_processor.py	94.28%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   70.31%   70.61%   +0.29%     
==========================================
  Files          31       32       +1     
  Lines        3261     3301      +40     
  Branches      542      550       +8     
==========================================
+ Hits         2293     2331      +38     
- Misses        801      802       +1     
- Partials      167      168       +1     

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