fix: Update FetchHttpClient to send empty string for empty POST/PUT/PATCH requests. #1527
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r? @kamil-stripe
Summary
Updates the FetchHttpClient to explicitly send an empty string for methods which expect a payload but have no request data.
Motivation
Fixes #1519
Deno injects a second
Content-Length
header when we don't specify body explicitly (ie. pass a concrete value other than undefined), causing Stripe POST requests without bodies to fail. By passing an explicit body, this will no longer happen.Release plan
This is a clean cherry-pick of #1521 with nothing changed. It has been tested in beta and confirmed by reporter that it fixes the issue.