Neos\Flow\Http\Headers::set PHP Метод

    public function set($name, $values, $replaceExistingHeader = true)
    {
        if (strtoupper(substr($name, 0, 10)) === 'SET-COOKIE') {
            throw new \InvalidArgumentException('The "Set-Cookie" headers must be set via setCookie().', 1345128153);
        }
        if ($values instanceof \DateTimeInterface) {
            $date = clone $values;
            $date->setTimezone(new \DateTimeZone('GMT'));
            $values = [$date->format('D, d M Y H:i:s') . ' GMT'];
        } else {
            $values = (array) $values;
        }
        switch ($name) {
            case 'Cache-Control':
                if (count($values) !== 1) {
                    throw new \InvalidArgumentException('The "Cache-Control" header must be unique and thus only one field value may be specified.', 1337849415);
                }
                $this->setCacheControlDirectivesFromRawHeader(array_pop($values));
                break;
            case 'Cookie':
                if (count($values) !== 1) {
                    throw new \InvalidArgumentException('The "Cookie" header must be unique and thus only one field value may be specified.', 1345127727);
                }
                $this->setCookiesFromRawHeader(array_pop($values));
                break;
            default:
                if ($replaceExistingHeader === true || !isset($this->fields[$name])) {
                    $this->fields[$name] = $values;
                } else {
                    $this->fields[$name] = array_merge($this->fields[$name], $values);
                }
        }
    }

 /**
  * Sets the specified HTTP header
  *
  * DateTime objects will be converted to a string representation internally but
  * will be returned as DateTime objects on calling getHeader().
  *
  * Please note that dates are normalized to GMT internally, so that getHeader() will return
  * the same point in time, but not necessarily in the same timezone, if it was not
  * GMT previously. GMT is used synonymously with UTC as per RFC 2616 3.3.1.
  *
  * @param string $name Name of the header, for example "Location", "Content-Description" etc.
  * @param array|string|\DateTime $values An array of values or a single value for the specified header field
  * @param boolean $replaceExistingHeader If a header with the same name should be replaced. Default is TRUE.
  * @return self This message, for method chaining
  * @throws \InvalidArgumentException
  * @api
  */
 public function setHeader($name, $values, $replaceExistingHeader = true)
 {
     switch ($name) {
         case 'Content-Type':
             if (is_array($values)) {
                 if (count($values) !== 1) {
                     throw new \InvalidArgumentException('The "Content-Type" header must be unique and thus only one field value may be specified.', 1454949291);
                 }
                 $values = (string) $values[0];
             }
             if (stripos($values, 'charset') === false && stripos($values, 'text/') === 0) {
                 $values .= '; charset=' . $this->charset;
             }
             break;
     }
     $this->headers->set($name, $values, $replaceExistingHeader);
     return $this;
 }