Cherrypy respond to unmounted or incorrect url - url

Question

I have been confused by the following:
I have a class TestLink mounted to the url /testlink
class TestLink(object):
exposed = True
#cherrypy.expose
#cherrypy.tools.accept(media='text/plain')
def GET(self, var=None, **params):
return "data:1,2\\nzelta:3,4"
if __name__ == '__main__':
app = cherrypy.tree.mount(
TestLink(), '/testlink',
"test.config"
)
And I use the Cherrypy rest dispatcher in my "test.config" file:
request.dispatch = cherrypy.dispatch.MethodDispatcher()
And when I hit start the server and hit the url "http://127.0.0.1:8080/testlink", I get the result. However, I also get result if I hit the url http://127.0.0.1:8080/testlink/x or "http://127.0.0.1:8080/testlink/anything_string". Why does this happen, shouldn't only the url "http://127.0.0.1:8080/testlink" return data?

Answer 1

Given your code example, if you try to access http://127.0.0.1:8080/testlink/foo/bar cherrypy will respond with 404 Not Found. This is because MethodDispatcher is interpreting 'foo' as value of the parameter 'var', as you specified in the signature of GET().
Here's a modified working version of your example:
import cherrypy
config = {
'/': {
'request.dispatch': cherrypy.dispatch.MethodDispatcher(),
'tools.trailing_slash.on': False,
}
}
class TestLink(object):
exposed = True
## not necessary, you want to use MethodDispatcher. See docs.
##cherrypy.expose
#cherrypy.tools.accept(media='text/plain')
def GET(self, var=None, **params):
print var, params
return "data:1,2\\nzelta:3,4"
if __name__ == '__main__':
app = cherrypy.tree.mount(TestLink(), '/testlink', config)
cherrypy.engine.start()
cherrypy.engine.block()
Now try http://127.0.0.1:8080/testlink/foo, it will print
foo {}
whereas hitting http://127.0.0.1:8080/testlink/foo/bar will lead to 404.
See the docs https://cherrypy.readthedocs.org/en/3.3.0/refman/_cpdispatch.html, or of course you could investigate the code in the module cherrypy/_cpdispatch.py yourself.