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CherryPy / cherrypy / tutorial / tut10_http_errors.py

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Tutorial: HTTP errors

HTTPError is used to return an error response to the client.
CherryPy has lots of options regarding how such errors are
logged, displayed, and formatted.


import os
localDir = os.path.dirname(__file__)
curpath = os.path.normpath(os.path.join(os.getcwd(), localDir))

import cherrypy

class HTTPErrorDemo(object):
    # Set a custom response for 403 errors.
    _cp_config = {'error_page.403' : os.path.join(curpath, "custom_error.html")}
    def index(self):
        # display some links that will result in errors
        tracebacks = cherrypy.request.show_tracebacks
        if tracebacks:
            trace = 'off'
            trace = 'on'
        return """
            <p>Toggle tracebacks <a href="toggleTracebacks">%s</a></p>
            <p><a href="/doesNotExist">Click me; I'm a broken link!</a></p>
            <p><a href="/error?code=403">Use a custom error page from a file.</a></p>
            <p>These errors are explicitly raised by the application:</p>
                <li><a href="/error?code=400">400</a></li>
                <li><a href="/error?code=401">401</a></li>
                <li><a href="/error?code=402">402</a></li>
                <li><a href="/error?code=500">500</a></li>
            <p><a href="/messageArg">You can also set the response body
            when you raise an error.</a></p>
        """ % trace
    index.exposed = True
    def toggleTracebacks(self):
        # simple function to toggle tracebacks on and off 
        tracebacks = cherrypy.request.show_tracebacks
        cherrypy.config.update({'request.show_tracebacks': not tracebacks})
        # redirect back to the index
        raise cherrypy.HTTPRedirect('/')
    toggleTracebacks.exposed = True
    def error(self, code):
        # raise an error based on the get query
        raise cherrypy.HTTPError(status = code)
    error.exposed = True
    def messageArg(self):
        message = ("If you construct an HTTPError with a 'message' "
                   "argument, it wil be placed on the error page "
                   "(underneath the status line by default).")
        raise cherrypy.HTTPError(500, message=message)
    messageArg.exposed = True

import os.path
tutconf = os.path.join(os.path.dirname(__file__), 'tutorial.conf')

if __name__ == '__main__':
    # CherryPy always starts with app.root when trying to map request URIs
    # to objects, so we need to mount a request handler root. A request
    # to '/' will be mapped to HelloWorld().index().
    cherrypy.quickstart(HTTPErrorDemo(), config=tutconf)
    # This branch is for the test suite; you can ignore it.
    cherrypy.tree.mount(HTTPErrorDemo(), config=tutconf)