src/Guzzle/Plugin/Cache/CachePlugin.php
protected function addResponseHeaders(RequestInterface $request, Response $response)
    {
        $params = $request->getParams();
        $response->setHeader('Via', sprintf('%s GuzzleCache/%s', $request->getProtocolVersion(), Version::VERSION));

        $lookup = ($params['cache.lookup'] === true ? 'HIT' : 'MISS') . ' from GuzzleCache';
        if ($header = $response->getHeader('X-Cache-Lookup')) {
            // Don't add duplicates
            $values = $header->toArray();
            $values[] = $lookup;
            $response->setHeader('X-Cache-Lookup', array_unique($values));
        } else {
            $response->setHeader('X-Cache-Lookup', $lookup);
        }

        if ($params['cache.hit'] === true) {
            $xcache = 'HIT from GuzzleCache';
        } elseif ($params['cache.hit'] == 'error') {
            $xcache = 'HIT_ERROR from GuzzleCache';
        } else {
            $xcache = 'MISS from GuzzleCache';
        }

        if ($header = $response->getHeader('X-Cache')) {
            // Don't add duplicates
            $values = $header->toArray();
            $values[] = $xcache;
            $response->setHeader('X-Cache', array_unique($values));
        } else {
            $response->setHeader('X-Cache', $xcache);
        }

        if ($response->isFresh() === false) {
            $response->addHeader('Warning', sprintf('110 GuzzleCache/%s "Response is stale"', Version::VERSION));
            if ($params['cache.hit'] === 'error') {
                $response->addHeader('Warning', sprintf('111 GuzzleCache/%s "Revalidation failed"', Version::VERSION));
            }
        }
    }
protected function addResponseHeaders(RequestInterface $request, Response $response)
    {
        $params = $request->getParams();
        $response->setHeader('Via', sprintf('%s GuzzleCache/%s', $request->getProtocolVersion(), Version::VERSION));

        $lookup = ($params['cache.lookup'] === true ? 'HIT' : 'MISS') . ' from GuzzleCache';
        if ($header = $response->getHeader('X-Cache-Lookup')) {
            // Don't add duplicates
            $values = $header->toArray();
            $values[] = $lookup;
            $response->setHeader('X-Cache-Lookup', array_unique($values));
        } else {
            $response->setHeader('X-Cache-Lookup', $lookup);
        }

        if ($params['cache.hit'] === true) {
            $xcache = 'HIT from GuzzleCache';
        } elseif ($params['cache.hit'] == 'error') {
            $xcache = 'HIT_ERROR from GuzzleCache';
        } else {
            $xcache = 'MISS from GuzzleCache';
        }

        if ($header = $response->getHeader('X-Cache')) {
            // Don't add duplicates
            $values = $header->toArray();
            $values[] = $xcache;
            $response->setHeader('X-Cache', array_unique($values));
        } else {
            $response->setHeader('X-Cache', $xcache);
        }

        if ($response->isFresh() === false) {
            $response->addHeader('Warning', sprintf('110 GuzzleCache/%s "Response is stale"', Version::VERSION));
            if ($params['cache.hit'] === 'error') {
                $response->addHeader('Warning', sprintf('111 GuzzleCache/%s "Revalidation failed"', Version::VERSION));
            }
        }
    }
protected function addResponseHeaders ( RequestInterface $ request , Response $ response ) { $ params = $ request -> getParams ( ) ; $ response -> setHeader ( 'Via' , sprintf ( '%s GuzzleCache/%s' , $ request -> getProtocolVersion ( ) , Version :: VERSION ) ) ; $ lookup = ( $ params [ 'cache.lookup' ] === true ? 'HIT' : 'MISS' ) . ' from GuzzleCache' ; if ( $ header = $ response -> getHeader ( 'X-Cache-Lookup' ) ) { // Don't add duplicates $ values = $ header -> toArray ( ) ; $ values [ ] = $ lookup ; $ response -> setHeader ( 'X-Cache-Lookup' , array_unique ( $ values ) ) ; } else { $ response -> setHeader ( 'X-Cache-Lookup' , $ lookup ) ; } if ( $ params [ 'cache.hit' ] === true ) { $ xcache = 'HIT from GuzzleCache' ; } elseif ( $ params [ 'cache.hit' ] == 'error' ) { $ xcache = 'HIT_ERROR from GuzzleCache' ; } else { $ xcache = 'MISS from GuzzleCache' ; } if ( $ header = $ response -> getHeader ( 'X-Cache' ) ) { // Don't add duplicates $ values = $ header -> toArray ( ) ; $ values [ ] = $ xcache ; $ response -> setHeader ( 'X-Cache' , array_unique ( $ values ) ) ; } else { $ response -> setHeader ( 'X-Cache' , $ xcache ) ; } if ( $ response -> isFresh ( ) === false ) { $ response -> addHeader ( 'Warning' , sprintf ( '110 GuzzleCache/%s "Response is stale"' , Version :: VERSION ) ) ; if ( $ params [ 'cache.hit' ] === 'error' ) { $ response -> addHeader ( 'Warning' , sprintf ( '111 GuzzleCache/%s "Revalidation failed"' , Version :: VERSION ) ) ; } } }
Add the plugin's headers to a response

@param RequestInterface $request  Request
@param Response         $response Response to add headers to
Add the plugin s headers to a response