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Structured descriptive administrative or technical information about content and media.
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observe_content_types_dispatch/3
Get available content types and their dispatch rules Example: {{<<”text”>>, <<”html”>>, []}, page} A special dispatch rule is ‘page_url’, which refers to the page_url property of the resource.
observe_media_identify_file/2
Try to identify a file, returning a map with file properties.
observe_resource_headers/3
Let all modules add resource specific response headers to the request. The accumulator is the list of headers to be set.