fix: The cors middleware didn't work

[hwbrzzl]

Closes #

📑 Description

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

[codecov-commenter]

Codecov Report

Patch coverage: 82.60% and project coverage change: -0.19% ⚠️

Comparison is base (63d411c) 77.07% compared to head (5dd9756) 76.89%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
- Coverage   77.07%   76.89%   -0.19%     
==========================================
  Files           9        9              
  Lines         711      714       +3     
==========================================
+ Hits          548      549       +1     
- Misses        133      135       +2     
  Partials       30       30              

Files Changed	Coverage Δ
cors.go	84.44% <72.00%> (-2.52%)	⬇️
group.go	98.80% <94.73%> (+1.80%)	⬆️
route.go	90.00% <100.00%> (-0.33%)	⬇️

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[devhaozi]

LGTM