Header options can be supplied via the <code>$headers</code> argument. Empty string values can be specified to invalidate default values. By default, the following header options will be returned:
* <code>Cache-Control</code>: <code>max-age=3600,public</code>
<br/>
Serialization parameters can be supplied via the <code>$output</code> argument. Empty string values can be specified to invalidate default values. By default, the following serialization parameters will be returned:
* <code>media-type</code>: <code>application/octet-stream</code>