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 #408 into feature/rest will decrease coverage by 0.29%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           feature/rest     #408      +/-   ##
================================================
- Coverage         67.53%   67.24%   -0.30%     
================================================
  Files               170      170              
  Lines              8596     8596              
================================================
- Hits               5805     5780      -25     
- Misses             2247     2269      +22     
- Partials            544      547       +3     

Impacted Files	Coverage Δ
...config_reader/reader_impl/default_config_reader.go	69.23% <ø> (ø)
protocol/dubbo/listener.go	57.52% <0.00%> (-5.38%)	⬇️
protocol/dubbo/codec.go	72.50% <0.00%> (-5.00%)	⬇️
protocol/dubbo/pool.go	76.71% <0.00%> (-4.57%)	⬇️
filter/filter_impl/hystrix_filter.go	68.64% <0.00%> (-3.39%)	⬇️
protocol/dubbo/readwriter.go	68.29% <0.00%> (-2.44%)	⬇️
config_center/nacos/facade.go	71.87% <0.00%> (+9.37%)	⬆️

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