Add support for Cache-Control in Directory and File HTTPHandler

[nspassov]

References:

• https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Caching
• https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Cache-Control
• https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/ETag
• https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-None-Match
• https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Expires
• https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-Modified-Since

[codecov]

Codecov Report

❌ Patch coverage is 77.65957% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.39%. Comparing base (a8358d1) to head (9454ebc).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
FlyingFox/Sources/HTTPCacheControl.swift	77.19%	13 Missing ⚠️
...ingFox/Sources/Handlers/DirectoryHTTPHandler.swift	80.00%	4 Missing ⚠️
FlyingFox/Sources/Handlers/FileHTTPHandler.swift	76.47%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #194      +/-   ##
==========================================
- Coverage   92.80%   92.39%   -0.42%     
==========================================
  Files          68       69       +1     
  Lines        3448     3536      +88     
==========================================
+ Hits         3200     3267      +67     
- Misses        248      269      +21     

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[nspassov]

Hey @swhitty , what are your thoughts on this?

[swhitty]

there is a cross platform SHA1 implementation in this repo that could be used instead — or at least used on other platforms without CryptoKit.

Even though SHA1 is not secure I don't think it matters for eTags really especially in the context of this DirectoryHTTPHandler

[swhitty]

thank you 🙏🏻