@app.route('<STR_LIT>', methods=['<STR_LIT:GET>'])<EOL><INDENT>def acme_challenge_ping(self, request):<DEDENT>
request.setResponseCode(OK)<EOL>write_request_json(request, {'<STR_LIT:message>': '<STR_LIT>'})<EOL>
Respond to requests on ``/.well-known/acme-challenge/ping`` to debug
path routing issues.