fix: infer media-type for falsy bodies except 'undefined' #2066
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This fixes a bug, where the
Content-Typeheader would be reset to the default, when therequest.bodycontains a falsy value.For example, given using the fetch api, when sending a request with body
0(i.e. the number zero), theContent-Typeheader would default totext/plain; utf-8(which is the browser default), even whenapplication/jsonwould be expected (and would be set if the request body was e.g.1, i.e. the number one).