Request.part()

Request
.part({
'content-type': 'application/json',
body: { foo: 'bar' }
})

does not work. No data sent.

How to set application/json type in .field('parameter', 'value') // Form field ?

Start by reproducing the Request.part() example and compare it with the .field('parameter', 'value') usage described in the issue. Trace how the request body and content type are handled, then verify that application/json data is sent as expected.

Written by the indexing model from the issue text.