Allow array HTTP/2 headers, Bug fixed for #4133

[doubaokun]

No description provided.

[codecov]

Codecov Report

Merging #4140 (ab23821) into master (7330c1a) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4140      +/-   ##
==========================================
- Coverage   48.81%   48.78%   -0.03%     
==========================================
  Files          71       71              
  Lines       14281    14281              
==========================================
- Hits         6971     6967       -4     
- Misses       7310     7314       +4     

Impacted Files	Coverage Δ
src/os/async_thread.cc	68.85% <0.00%> (-1.32%)	⬇️
src/coroutine/socket.cc	38.97% <0.00%> (-0.10%)	⬇️
src/protocol/base.cc	63.15% <0.00%> (ø)

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