This function allows a custom error message to be returned when a request cannot be served by an existing endpoint or filter.

pr_set_404(pr, fun)

Arguments

pr

A Plumber API. Note: The supplied Plumber API object will also be updated in place as well as returned by the function.

fun

A handler function

Value

The Plumber router with a modified 404 handler

Examples

if (FALSE) { handler_404 <- function(req, res) { res$status <- 404 res$body <- "Oops" } pr() %>% pr_get("/hi", function() "Hello") %>% pr_set_404(handler_404) %>% pr_run() }