When I try to cache private images (action with changed headers), headers are omitted

Question

I have the following action:

public function viewImageAction()
{
    $this->_helper->layout()->disableLayout();
    $this->_helper->viewRenderer->setNoRender();

    $filename = sanitize_filename($this->_request->getParam('file'), 'jpg');
    $data = file_get_contents(APPLICATION_PATH . '/../private-files/fans-pictures/' . $filename);
    $this->getResponse()
         ->setHeader('Content-type', 'image/jpeg')
         ->setBody($data);
}

And in my index.php before running the application I have:

/** Zend Cache to avoid unecessary application load **/
require_once 'Zend/Cache.php';

$frontendOptions = array(
'lifetime' => 3600,
'default_options' => array(
    'cache' => $cache_flag,
    'cache_with_cookie_variables' => true,
    'make_id_with_cookie_variables' => false),
'regexps' => array(
    '^(/.+)?/admin/?' => array('cache' => false),
    '^(/.+)?/pictures/view-image/?' => array('cache' => true),
    '^(/.+)?/authentication/?' => array('cache' => false),
    '^(/.+)?/fan-profile/?' => array('cache' => false),
    '^(/.+)?/fan-registration/?' => array('cache' => false))
);

$backendOptions = array(
'cache_dir' => APPLICATION_PATH . '/cache/pages/');

$cache = Zend_Cache::factory(
  'Page', 'File', $frontendOptions, $backendOptions
);

$cache->start();

The cache works fine, except that if I try to access the URL, for example public/admin/pictures/view-image/file/63.jpg, the headers will have text/htmlnot image/jpeg.

Am I doing something wrong?

EDITED

I tried:

'memorize_headers' => array('Content-type')

But nothing...

In addition, I noticed that this type of caching (before launching the application) cannot be performed in the administration areas, because the application must start and verify the session. Therefore, I need to put chache as soon as possible to avoid loading all involved components.

Any tips?

Answer 1

memorize_headers.

:

$frontendOptions = array(
'lifetime' => 3600,
'default_options' => array(
    'cache' => $cache_flag,
    'cache_with_cookie_variables' => true,
    'memorize_headers' => array('Content-Type', 'Content-Encoding'),
    'make_id_with_cookie_variables' => false),
'regexps' => array(
    '^(/.+)?/admin/?' => array('cache' => false),
    '^(/.+)?/admin/pictures/view-image/?' => array('cache' => true),
    '^(/.+)?/authentication/?' => array('cache' => false),
    '^(/.+)?/fan-profile/?' => array('cache' => false),
    '^(/.+)?/fan-registration/?' => array('cache' => false))
);

default_options:

$frontendOptions = array(
'lifetime' => 3600,
'memorize_headers' => array('Content-Type', 'Content-Encoding'),
'default_options' => array(
    'cache' => $cache_flag,
    'cache_with_cookie_variables' => true,
    //'cache_with_session_variables' => true,
    'make_id_with_cookie_variables' => false),
'regexps' => array(
    '^(/.+)?/admin/?' => array('cache' => false),
    '^(/.+)?/admin/pictures/view-image/?' => array('cache' => true),
    '^(/.+)?/authentication/?' => array('cache' => false),
    '^(/.+)?/fan-profile/?' => array('cache' => false),
    '^(/.+)?/fan-registration/?' => array('cache' => false))
);

.