slickframework / http

     * @return static

     * @throws \InvalidArgumentException for invalid header names or values.

     */

    public function withHeader($name, $value)

    {

        $key = $this->headerKey($name);

        $message = clone $this;

        $message->headers[$key] = is_array($value) ? $value : [$value];

        return $message;

    }

    /**

     * Return an instance with the specified header appended with the given value.

     * @param string $name Case-insensitive header field name to remove.

     * @return static

     */

    public function withoutHeader($name)

    {

        $message = clone $this;

        $key = $this->headerKey($name);

        if (array_key_exists($key, $message->headers)) {

            unset($message->headers[$key]);

        }

        return $message;

    }

    /**

     * Gets the body of the message.