Any explicit Content-Type header should take precedence over the encoding default.

Line 643 in eba29da

content_type = "application/json"

I send json argument and content type when i do request, but my content type is replacing to "application/json". I think it is bug

@daxartio

What exact use case are you facing that requires passing json=... while setting a Content-Type to something else than application/json?

As a workaround, using data=... should allow you to set the Content-Type yourself:

data: bytes = serialize(some_dict)
r = await httpx.post(url, data=data, headers={"content-type": "application/x-myformat"})

Sure thing.

We shouold probably change this...

Line 627 in eba29da

self.headers["Content-Type"] = content_type

To self.headers.setdefault('Content-Type', content_type), so that if the user has explicitly set a Content-Type header that takes precedence.

(Or else leave that line as it is an use if content_type and 'Content-Type' not in self.headers in the previous line.)

Pull requests accepted.

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