pr_filter function

Add a filter to Plumber router

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)

Arguments

• pr: A Plumber API. Note: The supplied Plumber API object will also be updated in place as well as returned by the function.
• name: A character string. Name of filter
• expr: An expr that resolve to a filter function or a filter function
• serializer: A serializer function

Returns

The Plumber router with the defined filter added

Examples

## Not run:

pr() %>%
  pr_filter("foo", function(req, res) {
    print("This is filter foo")
    forward()
  }) %>%
  pr_get("/hi", function() "Hello") %>%
  pr_run()
## End(Not run)