mux rule support multi hosts

[localvar]

hope this change could also make the implementation of gateway api easier.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06 🎉

Comparison is base (6ff9ac6) 81.67% compared to head (44a79c1) 81.73%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1024      +/-   ##
==========================================
+ Coverage   81.67%   81.73%   +0.06%     
==========================================
  Files         135      135              
  Lines       15044    15051       +7     
==========================================
+ Hits        12287    12302      +15     
+ Misses       2199     2194       -5     
+ Partials      558      555       -3     

Impacted Files	Coverage Δ
pkg/object/httpserver/routers/spec.go	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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