Fix SetAllowGetMethodPayload option ignored for io.Reader payload

[picollomartin]

Hi 👋 !

We detect some inconsistent behaviour of the current implementation of the SetAllowGetMethodPayload based on the input type passed to SetBody option:

• SetAllowGetMethodPayload = false

  • Body type = io.Reader => body is sent in GET
  • Body type = non io.Reader => body is not sent in GET

• SetAllowGetMethodPayload = true

  • Body type = io.Reader => body is sent in GET
  • Body type = non io.Reader => body is sent in GET

Basically you can bypass the option AllowGetMethodPayload if you send an io.Reader as a Body, this fixes that for be consistent to all types and add a test case for test disabled option

[codecov]

Codecov Report

Merging #541 (0f75cb5) into master (45d9f8b) will decrease coverage by 0.55%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #541      +/-   ##
==========================================
- Coverage   96.39%   95.84%   -0.55%     
==========================================
  Files          10       10              
  Lines        1330     1325       -5     
==========================================
- Hits         1282     1270      -12     
- Misses         30       34       +4     
- Partials       18       21       +3     

Impacted Files	Coverage Δ
middleware.go	91.27% <100.00%> (-1.59%)	⬇️
request.go	95.25% <0.00%> (-1.10%)	⬇️

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[jeevatkm]

@picollomartin I'm sorry for the delayed attention on the PR. Thank you for your contribution.
Agreed, inconsistent behavior will lead to consuming investigation time. This PR provided insight for #618.