support set upstream host

[suchen-sci]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 79.49%. Comparing base (a252e90) to head (7637d52).

Files	Patch %	Lines
pkg/filters/proxies/httpproxy/pool.go	37.50%	3 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1245      +/-   ##
==========================================
- Coverage   79.50%   79.49%   -0.02%     
==========================================
  Files         152      152              
  Lines       17289    17295       +6     
==========================================
+ Hits        13746    13748       +2     
- Misses       2876     2879       +3     
- Partials      667      668       +1     

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