fix proxy url bug

[wangzhankun]

#91

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (5fbe0f3) 27.64% compared to head (86f5cd1) 27.61%.

Files	Patch %	Lines
ai/engine.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
- Coverage   27.64%   27.61%   -0.03%     
==========================================
  Files          17       17              
  Lines        1259     1260       +1     
==========================================
  Hits          348      348              
- Misses        898      899       +1     
  Partials       13       13              

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