chore(request): check reader if it's nil before reading

[noahyao1024]

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[appleboy]

@noahyao1024 Please add some testing flow.

[codecov]

Codecov Report

Merging #3419 (a0ea288) into master (80cd679) will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3419      +/-   ##
==========================================
- Coverage   98.27%   98.18%   -0.10%     
==========================================
  Files          42       42              
  Lines        3137     3140       +3     
==========================================
  Hits         3083     3083              
- Misses         40       42       +2     
- Partials       14       15       +1     

Flag	Coverage Δ
	98.18% <0.00%> (-0.10%)	⬇️
go-1.16	?
go-1.17	98.08% <0.00%> (-0.10%)	⬇️
go-1.18	98.08% <0.00%> (-0.10%)	⬇️
go-1.19	98.18% <0.00%> (-0.10%)	⬇️
macos-latest	98.08% <0.00%> (-0.19%)	⬇️
ubuntu-latest	98.18% <0.00%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
context.go	97.47% <0.00%> (-0.50%)	⬇️

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