optimize: unify timeout error

[welkeyever]

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optimize

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保持一致的超时错误返回

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[codecov]

Codecov Report

Patch coverage: 33.33% and project coverage change: -0.03% ⚠️

Comparison is base (f4cde92) 79.86% compared to head (d19c117) 79.83%.
Report is 1 commits behind head on develop.

❗ Current head d19c117 differs from pull request most recent head 43115be. Consider uploading reports for the commit 43115be to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #884      +/-   ##
===========================================
- Coverage    79.86%   79.83%   -0.03%     
===========================================
  Files           97       97              
  Lines         9587     9598      +11     
===========================================
+ Hits          7657     7663       +6     
- Misses        1430     1435       +5     
  Partials       500      500              

Files Changed	Coverage Δ
pkg/network/netpoll/connection.go	70.21% <0.00%> (-3.13%)	⬇️
pkg/network/standard/connection.go	81.13% <0.00%> (-0.49%)	⬇️
pkg/common/test/mock/network.go	91.97% <33.33%> (-1.15%)	⬇️
pkg/protocol/http1/client.go	73.42% <33.33%> (+0.14%)	⬆️
pkg/protocol/http1/ext/common.go	70.12% <100.00%> (+0.19%)	⬆️

... and 2 files with indirect coverage changes

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