Plack::Middleware::HTTUsereContributed PerPlack::Middleware::HTTPExceptions(3)NAMEPlack::Middleware::HTTPExceptions - Catch HTTP exceptions
SYNOPSIS
use HTTP::Exception;
my $app = sub {
# ...
HTTP::Exception::500->throw;
};
builder {
enable "HTTPExceptions", rethrow => 1;
$app;
};
DESCRIPTIONPlack::Middleware::HTTPExceptions is a PSGI middleware component to
catch exceptions from applications that can be translated into HTTP
status codes.
Your application is supposed to throw an object that implements a
"code" method which returns the HTTP status code, such as 501 or 404.
This middleware catches them and creates a valid response out of the
code. If the "code" method returns a code that is not an HTTP redirect
or error code (3xx, 4xx, or 5xx), the exception will be rethrown.
The exception object may also implement "as_string" or overload
stringification to represent the text of the error. The text defaults
to the status message of the error code, such as Service Unavailable
for 503.
Finally, the exception object may implement "as_psgi", and the result
of this will be returned directly as the PSGI response.
If the code is in the 3xx range and the exception implements the
'location' method (HTTP::Exception::3xx does), the Location header will
be set in the response, so you can do redirects this way.
There are CPAN modules HTTP::Exception and HTTP::Throwable, and they
are perfect to throw from your application to let this middleware catch
and display, but you can also implement your own exception class to
throw.
If the thrown exception is not an object that implements either a
"code" or an "as_psgi" method, a 500 error will be returned, and the
exception is printed to the psgi.errors stream. Alternatively, you can
pass a true value for the "rethrow" parameter for this middleware, and
the exception will instead be rethrown. This is enabled by default when
"PLACK_ENV" is set to "development", so that the StackTrace middleware
can catch it instead.
AUTHOR
Tatsuhiko Miyagawa
SEE ALSO
paste.httpexceptions HTTP::Exception HTTP::Throwable
perl v5.18.22012-08-Plack::Middleware::HTTPExceptions(3)
