[http-client] Ignore case-sensitivity while matching header names

[uarlouski]

Spec:

• HTTP1.X - headers are case insensitive
• HTTP2.X - headers are in lower case

[github-actions]

Qodana for JVM

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.70%. Comparing base (bed746c) to head (660ad0f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##             master    #5642    +/-   ##
==========================================
  Coverage     97.69%   97.70%            
+ Complexity     7378     7135   -243     
==========================================
  Files           989      989            
  Lines         20685    20685            
  Branches       1353     1353            
==========================================
+ Hits          20209    20211     +2     
+ Misses          364      363     -1     
+ Partials        112      111     -1     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud