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REST API file extension

I want to return responses depending on the file extension of the request made to my Rest API:

1 case - No extension like /api/robots/1 I 'd like to return response with XML

2 case - /api/case/1.json I'd like to return response in JSON

The same way i would like to return response in .txt and .html

What is the way phalcon would deal with it?

Could not find such topic, please advise

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Accepted
answer

You can create routes where a parameter is the extension:

$router->add(
    "/documentation/{chapter}/{name}\.{type:[a-z]+}",
    array(
        "controller" => "documentation",
        "action"     => "show"
    )
);

https://docs.phalcon.io/en/latest/reference/routing.html#parameters-with-names