class Protocol::HTTP::Body::Writable

@returns [Output] The output wrapper.
@parameter output [Output] The output wrapper.
@yields {|output| ...} if a block is given.

If a block is given, and the block raises an error, the error will used to close the body by invoking {close} with the error.

Create an output wrapper which can be used to write chunks to the body.

def output
	output = Output.new(self)
	
	unless block_given?
		return output
	end
	
	begin
		yield output
	rescue => error
		raise error
	ensure
		output.close(error)
	end
end