src/Control/HTTPRequest.php
public function addHeader($header, $value)
    {
        $header = strtolower($header);
        $this->headers[$header] = $value;
        return $this;
    }
public function addHeader($header, $value)
    {
        $header = strtolower($header);
        $this->headers[$header] = $value;
        return $this;
    }
public function addHeader ( $ header , $ value ) { $ header = strtolower ( $ header ) ; $ this -> headers [ $ header ] = $ value ; return $ this ; }
Add a HTTP header to the response, replacing any header of the same name.

@param string $header Example: "content-type"
@param string $value Example: "text/xml"
Add a HTTP header to the response replacing any header of the same name .