feat: stringify body to search string for `Content-Type: application/x-www-form-urlencoded`

[kricsleo]

…orm-urlencoded`

resolves #425

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 87.04%. Comparing base (27996d3) to head (70ee9fa). :warning: Report is 76 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #482       +/-   ##
===========================================
+ Coverage   56.86%   87.04%   +30.17%     
===========================================
  Files          16        7        -9     
  Lines         728      440      -288     
  Branches      113      131       +18     
===========================================
- Hits          414      383       -31     
+ Misses        303       56      -247     
+ Partials       11        1       -10     

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