fix issue #711: Nacos registry doesn't work

[localvar]

No description provided.

[codecov-commenter]

Codecov Report

Merging #720 (e617a11) into main (d9ad9d6) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #720      +/-   ##
==========================================
- Coverage   80.14%   80.14%   -0.01%     
==========================================
  Files          95       95              
  Lines       10647    10652       +5     
==========================================
+ Hits         8533     8537       +4     
- Misses       1621     1624       +3     
+ Partials      493      491       -2     

Impacted Files	Coverage Δ
pkg/filters/proxy/pool.go	61.14% <0.00%> (-0.85%)	⬇️
pkg/filters/headerlookup/headerlookup.go	84.61% <0.00%> (-1.40%)	⬇️
pkg/cluster/cluster.go	60.10% <0.00%> (+0.52%)	⬆️
pkg/filters/validator/basicauth.go	78.80% <0.00%> (+1.38%)	⬆️

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[localvar]

@jthann , please help check if this pr fix #711 .