Use eTag for http caching

[BPerlakiH]

Fixes: #1007

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 37.98%. Comparing base (20ce554) to head (585e419).

Files with missing lines	Patch %	Lines
ViewModel/LibraryViewModel.swift	80.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1034      +/-   ##
==========================================
- Coverage   39.01%   37.98%   -1.04%     
==========================================
  Files         119      119              
  Lines        6959     6969      +10     
==========================================
- Hits         2715     2647      -68     
- Misses       4244     4322      +78     

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[rgaudin]

Mostly OK but those wide status code ranges are unnecessary and fragile

[rgaudin]

Question about code base: Are we currently following redirects? Should we return a redirect on the catalogURL (and eventually return the content), would that work as expected?

[BPerlakiH]

Question about code base: Are we currently following redirects? Should we return a redirect on the catalogURL (and eventually return the content), would that work as expected?

I did a test with this:

• set up a local Flask (python) server with redirect to the real kiwix catalog url
• pointed the application to get the catalog from the local URL
• and it is redirecting and fetching as predicted

[rgaudin]

Good