On Wednesday, 14 October 2020 15:43:05 UTC+1, [email protected] wrote:
>
> I'm creating my own bespoke 404 / 400 error page by editing routes.py like
> this:
>
> routes_onerror = [('app/400', '/app/default/custom_400.html')]
>
> and I have 2 questions:
>
> 1) The custom_400 page is displayed when from within a controller, I call
> e.g.
>
> raise HTTP(400, "my error message text")
>
> How do I access/display the error message text within my custom_400.html
> page?
>
> 2) If it is is not an HTML view which is being called, but a JSON view, I
> want to return a JSON page instead which, for example, reads {"error":"my
> error message text"}. How do I do that? Can I just create a
> custom_400.json view, and remove the .html from my line in routes.py?
>
>
If I remember correctly, the message in your point 1) will only display if
you do not have a custom page.... it overrides the default plain http error
code text that web2py produces.
As to point 2) which may help you solve point 1) as well, I think you may
need to use dynamic error pages.
For example, I have a controller called 'errors' that looks like this:
def error_404():
""" Dynamic 404 error page... receives
<Storage {'ticket': 'None',
'code': '404',
'request_url': '/the_url',
'requested_uri': 'the_full_uri'}>
"""
# Set response code to original error, otherwise it will be 302.
response.status = 404
is_property = '/propert' in request.vars.requested_uri.lower()
if is_property:
return response.render('errors/error_404_property.html', {}) #
This is an ordinary view so pass variables in the dict as 2nd parameter.
else:
return response.render('errors/error_404_general.html', {})
Then I have two (normal) views in /applications/myapp/views/errors that
correspond to the two views used above with different messages.
In routes.py:
routes_onerror = [
(r'*/400', r'/static/400.html'), # bad request
(r'*/403', r'/static/403.html'), # forbidden
(r'*/404', r'/errors/error_404'), # DYNAMIC - not found page
]
Having said all that, to return json on 400 error, I would test whether
this works for you:
No views need to be created. In the errors controller, in the function you
create, just return dict(error='my err message') In routes_onerror,
try: ('app/400', '/app/default/custom_400.json'). Web2py's automatic json
conversion should kick in and return the json if all goes well. Remember
to restart your app each time you change anything in routes.py.
See:
http://www.web2py.com/books/default/chapter/29/03/overview?search=json#Simple-examples
for how the .json extension should automatically work.
HTH,
--
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- http://web2py.com/book (Documentation)
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