Fix Rest protocol

[Patrick0308]

What this PR does:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-io]

Codecov Report

Merging #370 into feature/rest will increase coverage by 0.14%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           feature/rest    #370      +/-   ##
===============================================
+ Coverage         66.75%   66.9%   +0.14%     
===============================================
  Files               158     158              
  Lines              8230    8230              
===============================================
+ Hits               5494    5506      +12     
+ Misses             2210    2200      -10     
+ Partials            526     524       -2

Impacted Files	Coverage Δ
config_center/nacos/client.go	57.26% <0%> (+1.7%)	⬆️
cluster/cluster_impl/failback_cluster_invoker.go	80.64% <0%> (+2.15%)	⬆️
config_center/nacos/facade.go	62.5% <0%> (+25%)	⬆️

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[AlexStocks]

LGTM