http:status

[semidet,multifile]http:status_page(+Status, +Context, -HTMLTokens)

Hook called by http_status_reply/4 and http_status_reply/5 that allows for emitting custom error pages for the following HTTP page types:

201 - created(Location)
301 - moved(To)
302 - moved_temporary(To)
303 - see_other(To)
400 - bad_request(ErrorTerm)
401 - authorise(AuthMethod)
403 - forbidden(URL)
404 - not_found(URL)
405 - method_not_allowed(Method,URL)
406 - not_acceptable(Why)
500 - server_error(ErrorTerm)
503 - unavailable(Why)

The hook is tried twice, first using the status term, e.g., not_found(URL) and than with the code, e.g. 404. The second call is deprecated and only exists for compatibility.

`Context`	is the 4th argument of http_status_reply/5, which is invoked after raising an exception of the format `http_reply(Status, HeaderExtra, Context)`. The default context is `[]` (the empty list).
`HTMLTokens`	is a list of tokens as produced by html//1. It is passed to print_html/2.