httr (version 1.1.0)

stop_for_status: Take action on http error.

Description

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.

Usage

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)

x <- GET("http://httpbin.org/status/300")
stop_for_status(x)
warn_for_status(x)
message_for_status(x)

x <- GET("http://httpbin.org/status/404")
stop_for_status(x)
warn_for_status(x)
message_for_status(x)

# You can provide more information with the task argumgnet
warn_for_status(x, "download spreadsheet")
message_for_status(x, "download spreadsheet")