# Set request's body
	private fun set_body : CURLCode
	do
		var err
		var data = self.data
		var body = self.body

		if data != null then
			var postdatas = data.to_url_encoded(self.curl)
			err = self.curl.native.easy_setopt(new CURLOption.postfields, postdatas)
			if not err.is_ok then return err
		else if body != null then
			err = self.curl.native.easy_setopt(new CURLOption.postfields, body)
			if not err.is_ok then return err
		end
		return new CURLCode.ok
	end