fix(proxy): separate multiple cookie headers

[meixger]

re: #318 proxying multiple cookies and split by comma

[codecov]

Codecov Report

Merging #319 (4326fe0) into main (45e6dd4) will increase coverage by 1.07%.
The diff coverage is 97.64%.

❗ Current head 4326fe0 differs from pull request most recent head aa0a14c. Consider uploading reports for the commit aa0a14c to get more accurate results

@@            Coverage Diff             @@
##             main     #319      +/-   ##
==========================================
+ Coverage   70.85%   71.92%   +1.07%     
==========================================
  Files          22       23       +1     
  Lines        1983     2066      +83     
  Branches      289      303      +14     
==========================================
+ Hits         1405     1486      +81     
- Misses        578      580       +2     

Impacted Files	Coverage Δ
src/utils/internal/multipart.ts	97.35% <ø> (ø)
src/utils/internal/split-cookies-string.ts	97.43% <97.43%> (ø)
src/utils/body.ts	88.61% <100.00%> (ø)
src/utils/proxy.ts	77.46% <100.00%> (+0.82%)	⬆️

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[pi0]

Thanks ❤️

[oleghalin]

I have problem with this PR, Second cookie from header not applied and found next in the web

Origin servers SHOULD NOT fold multiple Set-Cookie header fields into a single header field. The usual mechanism for folding HTTP headers fields (i.e., as defined in [RFC2616]) might change the semantics of the Set-Cookie header field because the %x2C (",") character is used by Set-Cookie in a way that conflicts with such folding.

What you think @pi0 ?