How to force 204 response for captive portal detection?

[Alexander Krause]

Hi all!

Does anybody know how to force cherrypy 3.8.0 to generate an empty 204 response? This seems to be required by some captive-portal detection methods like in Android 4.

I tried different things:

#gives 303 See Other
if '/generate_204' in uri:

    cherrypy.response.status = '204'
  raise cherrypy.HTTPRedirect('/')

#complains about error code < 300
if '/generate_204' in uri:
  raise cherrypy.HTTPError(204)

Thanks a lot for any hints!

[Sylvain Hellegouarch]

Hi Alexander,

I think you have to make a decision, either you wish to redirect (303) or respond with an empty content (204). So it's either: 

@cherrypy.expose

def handler(self):

     cherrypy.response.status = '204'

     # not mandatory, just a hint for the client. 

     cherrypy.response.headers['Content-Location'] = '/'

OR

@cherrypy.expose

def handler(self):

     raise cherrypy.HTTPRedirect('/')

--

- Sylvain
http://www.defuze.org
http://twitter.com/lawouach

[Alexander Krause]

An empty 204 would be perfect. Unfortunately I'm doing this in a custom cherrypy-tool:

def global_redirect(urls=None):

if urls:

uri=cherrypy.url()

print(uri)

if '/generate_204' in uri:

cherrypy.response.status = '204'

cherrypy.response.headers['Content-Location'] = '/'

cherrypy.tools.global_redirect = cherrypy.Tool(

'before_handler',

global_redirect,

priority=20

)

Do you know how I need to exit from here? Normally I've to raise an Exception:

raise cherrypy.HTTPRedirect(...)

[Alexander Krause]

Code hier eingeben...

Am Mittwoch, 2. September 2015 08:44:56 UTC+2 schrieb Alexander Krause:

[Alexander Krause]

I guess the simpliest way is to define a custom exception:

class Error204(cherrypy.HTTPError):

def __init__(self, message=None):

self.status = 204

self._message = message

cherrypy.CherryPyException.__init__(self, 204, message)

Am Mittwoch, 2. September 2015 08:44:56 UTC+2 schrieb Alexander Krause:

[Sylvain Hellegouarch]

Or, perhaps, in that case a dedicated dispatcher instead of a tool?

http://docs.cherrypy.org/en/latest/extend.html#tailored-dispatchers

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