Fix problem of rest protocol PR #352

[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 #402 into feature/rest will increase coverage by 0.04%.
The diff coverage is 68.75%.

@@               Coverage Diff                @@
##           feature/rest     #402      +/-   ##
================================================
+ Coverage         67.48%   67.53%   +0.04%     
================================================
  Files               170      170              
  Lines              8591     8596       +5     
================================================
+ Hits               5798     5805       +7     
+ Misses             2252     2247       -5     
- Partials            541      544       +3     

Impacted Files	Coverage Δ
common/extension/rest_client.go	0.00% <0.00%> (ø)
common/extension/rest_config_reader.go	0.00% <0.00%> (ø)
common/extension/rest_server.go	0.00% <0.00%> (ø)
...config_reader/reader_impl/default_config_reader.go	69.23% <63.63%> (ø)
protocol/rest/rest_protocol.go	75.34% <75.00%> (-4.94%)	⬇️
config/rest_config_loader.go	77.10% <76.00%> (ø)
config/config_loader.go	63.71% <100.00%> (+1.33%)	⬆️
protocol/rest/rest_invoker.go	72.54% <100.00%> (ø)
config_center/nacos/client.go	57.26% <0.00%> (+1.70%)	⬆️
config_center/nacos/facade.go	62.50% <0.00%> (+25.00%)	⬆️

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