merge response headers in proxy (close #713)

[localvar]

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[codecov-commenter]

Codecov Report

Merging #727 (c252fa3) into main (7d9f590) will increase coverage by 0.30%.
The diff coverage is 95.65%.

@@            Coverage Diff             @@
##             main     #727      +/-   ##
==========================================
+ Coverage   80.38%   80.69%   +0.30%     
==========================================
  Files          98       98              
  Lines       10701    10707       +6     
==========================================
+ Hits         8602     8640      +38     
+ Misses       1609     1581      -28     
+ Partials      490      486       -4     

Impacted Files	Coverage Δ
pkg/filters/proxy/memorycache.go	92.68% <0.00%> (-3.52%)	⬇️
pkg/filters/corsadaptor/corsadaptor.go	90.62% <100.00%> (+1.73%)	⬆️
pkg/filters/proxy/pool.go	76.73% <100.00%> (+7.39%)	⬆️
pkg/filters/headerlookup/headerlookup.go	86.01% <0.00%> (+1.39%)	⬆️

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