fix-383

[guonaihong]

1. 解决golangci-lint 99%的错误
2. 如果只获取Response(), 当WithContext在SetTimeout前面时，会导致context cancel错误 #383

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.31034% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 82.09%. Comparing base (c72fd8f) to head (478a99c).

Files	Patch %	Lines
dataflow/validator.go	33.33%	2 Missing and 2 partials ⚠️
dataflow/req.go	75.00%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #388      +/-   ##
==========================================
- Coverage   82.28%   82.09%   -0.19%     
==========================================
  Files          48       48              
  Lines        1981     1960      -21     
==========================================
- Hits         1630     1609      -21     
+ Misses        279      278       -1     
- Partials       72       73       +1     

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