use io.Pipe for build request

[negasus]

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[codecov-commenter]

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Codecov Report

❌ Patch coverage is 37.50000% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.02%. Comparing base (24c36eb) to head (c8e249b).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
raw_request.go	37.50%	11 Missing and 4 partials ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
- Coverage   45.40%   45.02%   -0.39%     
==========================================
  Files          29       29              
  Lines        2341     2343       +2     
==========================================
- Hits         1063     1055       -8     
- Misses       1231     1239       +8     
- Partials       47       49       +2     

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