sanic/docs/exceptions.md

Exceptions

Exceptions can be thrown from within request handlers and will automatically be handled by Sanic. Exceptions take a message as their first argument, and can also take a status_code to be passed back in the HTTP response. Check sanic.exceptions for the full list of exceptions to throw.

Throwing an exception

from sanic import Sanic
from sanic.exceptions import ServerError

@app.route('/killme')
def i_am_ready_to_die(request):
	raise ServerError("Something bad happened")

Handling Exceptions

Just use the @exception decorator. The decorator expects a list of exceptions to handle as arguments. You can pass SanicException to catch them all! The exception handler must expect a request and exception object as arguments.

from sanic import Sanic
from sanic.response import text
from sanic.exceptions import NotFound

@app.exception(NotFound)
def ignore_404s(request, exception):
	return text("Yep, I totally found the page: {}".format(request.url))