LengthRequired error occured about faraday HOT 4 CLOSED

Try setting the 'Content-Length' header to 0. You're not sending a body with the PUT request.

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Awesome, it works (note to anyone seeing this : the length should be a string, not an integer).

Would it be thinkable to add it automatically in faraday ?

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I don't hate the idea. The behavior would have to be tested for each adapter. I believe they already set the Content-Length header if you pass a body. I don't want to do extra work in Faraday.

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I've seen this error when running current live tests. I haven't investigated which adapter causes this—it seems to me that Net::HTTP takes care of this automatically:

def send_request_with_body(sock, ver, path, body)
  self.content_length = body.bytesize
  delete 'Transfer-Encoding'
  supply_default_content_type
  write_header sock, ver, path
  sock.write body
end

So it must be some other adapter. Not sure if this is Faraday's responsibility.

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