feat: omit content-type header when no parameters are present

[tangcent]

close #1167

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 62.744%. Comparing base (bf67a5c) to head (5e9c24c). Report is 1 commits behind head on master.

Additional details and impacted files

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