fix: Allow optional whitespace in header values

[maklostermann]

Optional whitespace in the CacheControl header can also occur before the separating comma. Without this fix, request would fail with a FormatException.

We observed this in production:

FormatException: Error on line 1, column 14: expected no more input.
  ╷
1 │ max-age=17748 , stale-while-revalidate=604800, stale-if-error=604800
  │              ^

[maklostermann]

Hello @llfbandit,
as we saw this happening in production, it would be great to have that fix soon.

So please do not hesitate to reach out to me if something is unclear or should be changed. 🙃

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.39%. Comparing base (f041ec6) to head (a915aa3).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #188   +/-   ##
=======================================
  Coverage   98.39%   98.39%           
=======================================
  Files          36       36           
  Lines        1493     1494    +1     
=======================================
+ Hits         1469     1470    +1     
  Misses         24       24           

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[llfbandit]

Thanks for your contribution!

[maklostermann]

@llfbandit thanks for merging! I saw that you release this package to pub.dev quite regularly, do you already know when there will be the next one?

[llfbandit]

This has been released two days ago in http_cache_core 1.1.3.