Net::HTTPGenericRequest#send_request_with_body_stream

# File tmp/rubies/ruby-3.1.3/lib/net/http/generic_request.rb, line 193
def send_request_with_body_stream(sock, ver, path, f)
  unless content_length() or chunked?
    raise ArgumentError,
        "Content-Length not given and Transfer-Encoding is not `chunked'"
  end
  supply_default_content_type
  write_header sock, ver, path
  wait_for_continue sock, ver if sock.continue_timeout
  if chunked?
    chunker = Chunker.new(sock)
    IO.copy_stream(f, chunker)
    chunker.finish
  else
    IO.copy_stream(f, sock)
  end
end