public function addMultiple(array $headers): HeaderCollection
    {
        foreach ($headers as $key => $value) {
            $key = $this->getKey($key, true);
            \sndsgd\Arr::addValue($this->headers, $key, $value);
        }
        return $this;
    }
public function addMultiple(array $headers): HeaderCollection
    {
        foreach ($headers as $key => $value) {
            $key = $this->getKey($key, true);
            \sndsgd\Arr::addValue($this->headers, $key, $value);
        }
        return $this;
    }
public function addMultiple ( array $ headers ) : HeaderCollection { foreach ( $ headers as $ key => $ value ) { $ key = $ this -> getKey ( $ key , true ) ; \ sndsgd \ Arr :: addValue ( $ this -> headers , $ key , $ value ) ; } return $ this ; }
Add multiple headers

@param array<string,string> $headers
Add multiple headers