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Filters can be used to modify an incoming request, return an error, or return a response prior to the request reaching an endpoint.
pr_filter(pr, name, expr, serializer)
The Plumber router with the defined filter added
A Plumber API. Note: The supplied Plumber API object will also be updated in place as well as returned by the function.
A character string. Name of filter
An expr that resolve to a filter function or a filter function
A serializer function
if (FALSE) { pr() %>% pr_filter("foo", function(req, res) { print("This is filter foo") forward() }) %>% pr_get("/hi", function() "Hello") %>% pr_run() }
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