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diff --git a/guide/rest_handlers.md b/guide/rest_handlers.md index d5997f9..ac11d98 100644 --- a/guide/rest_handlers.md +++ b/guide/rest_handlers.md @@ -106,6 +106,19 @@ each function. For example, `from_html` and `to_html` indicate in the first case that we're accepting a resource given as HTML, and in the second case that we send one as HTML. +Cowboy will set informative meta values at various points of the +execution. You can retrieve them using `cowboy_req:meta/{2,3}`. +The values are defined in the following table. + +| Meta key | Details | +| -----------| ---------------------------------------------------- | +| media_type | The content-type negotiated for the response entity. | +| language | The language negotiated for the response entity. | +| charset | The charset negotiated for the response entity. | + +They can be used to reply a response entity to a request with +an idempotent method (`POST`, `PUT`, `PATCH`, `DELETE`). + Usage ----- |