public function unsetHeader(string $header)
    {
        $header = static::normalizeHeader($header);
        unset($this->headers[$header]);
        return $this;
    }
public function unsetHeader(string $header)
    {
        $header = static::normalizeHeader($header);
        unset($this->headers[$header]);
        return $this;
    }
public function unsetHeader ( string $ header ) { $ header = static :: normalizeHeader ( $ header ) ; unset ( $ this -> headers [ $ header ] ) ; return $ this ; }
Remove a header from the list of headers to send to the client

@param string $header The header to unset.
@return $this Provides fluent interface
Remove a header from the list of headers to send to the client