src/Valkyrja/Http/NativeResponse.php
public function setHeaders(array $headers = []): Response
    {
        // If the headers have no been set yet
        if (null === $this->headers) {
            // Set them to a new Headers collection
            $this->headers = new Headers();
        }

        // Set all the headers with the array provided
        $this->headers->setAll($headers);

        // If there is no cache control header
        if (! $this->headers->has('Cache-Control')) {
            // Set it to an empty string
            $this->headers->set('Cache-Control', '');
        }

        return $this;
    }
public function setHeaders(array $headers = []): Response
    {
        // If the headers have no been set yet
        if (null === $this->headers) {
            // Set them to a new Headers collection
            $this->headers = new Headers();
        }

        // Set all the headers with the array provided
        $this->headers->setAll($headers);

        // If there is no cache control header
        if (! $this->headers->has('Cache-Control')) {
            // Set it to an empty string
            $this->headers->set('Cache-Control', '');
        }

        return $this;
    }
Set response headers.

@param array $headers [optional] The headers to set

@return \Valkyrja\Http\Response