Take action on http error.

Converts http errors to R errors or warnings - these should always be used whenever you're creating requests inside a function, so that the user knows why a request has failed.

stop_for_status(x, task = NULL)

warn_for_status(x, task = NULL)

message_for_status(x, task = NULL)

Arguments

x	a response, or numeric http code (or other object with status_code method)
task	The text of the message: either NULL or a character vector. If non-NULL, the error message will finish with "Failed to task".

Value

If request was successful, the response (invisibly). Otherwise, raised a classed http error or warning, as generated by http_condition()

See also

http_status() and http://en.wikipedia.org/wiki/Http_status_codes for more information on http status codes.

Other response methods: content(), http_error(), http_status(), response()

Examples

x <- GET("http://httpbin.org/status/200")
stop_for_status(x) # nothing happens
warn_for_status(x)
message_for_status(x)
#> OK (HTTP 200).

x <- GET("http://httpbin.org/status/300")
if (FALSE) {
stop_for_status(x)
}
warn_for_status(x)
#> Warning: Multiple Choices (HTTP 300).
message_for_status(x)
#> Multiple Choices (HTTP 300).

x <- GET("http://httpbin.org/status/404")
if (FALSE) {
stop_for_status(x)
}
warn_for_status(x)
#> Warning: Not Found (HTTP 404).
message_for_status(x)
#> Not Found (HTTP 404).

# You can provide more information with the task argument
warn_for_status(x, "download spreadsheet")
#> Warning: Not Found (HTTP 404). Failed to download spreadsheet.
message_for_status(x, "download spreadsheet")
#> Not Found (HTTP 404). Failed to download spreadsheet.