Hi, i'm doing the issue https://github.com/kimchi-project/wok/issues/147, and got a problem to deal with exceptions and Javascript. I got this code at src/wok/root.py: # check for repetly l = len(self.failed_logins) if l >= 3: # verify if timeout is still valid last_try = self.failed_logins[l -1] if time.time() < (last_try["time"] + self.fail_timeout): details = e = UnauthorizedError("WOKAUTH0004E", {"seconds": self.fail_timeout}) log_request(code, params, details, method, 403) import pdb;pdb.set_trace() raise cherrypy.HTTPError(403, e.message) return e.message So, it may raise an exception. I want to filter this exception at UI. So i got this code: wok.login(settings, function(data) { var query = window.location.search; var next = /.*next=(.*?)(&|$)/g.exec(query); if (next) { var next_url = decodeURIComponent(next[1]); } else { var lastPage = wok.cookie.get('lastPage'); var next_url = lastPage ? lastPage.replace(/\"/g,'') : "/"; } wok.cookie.set('roles',JSON.stringify(data.roles)); window.location.replace(window.location.pathname.replace(/\/+login.html/, '') + next_url); }, function(jqXHR, textStatus, errorThrown) { if (jqXHR.responseText == "") { $("#messUserPass").hide(); $("#missServer").show(); } else { $("#missServer").hide(); $("#messUserPass").show(); } $("#messSession").hide(); $("#logging").hide(); $("#login").show(); }); The issue is: 1) If i raise a cherrypy.HTTPError, i got a html error with the message i created on the code. Here is an example http://pastebin.com/AjkWwHBz. The message is there, but i must parse it. 2) If i raise a InvalidOperation or other exception from wok, i receive a error 500: { "reason":"The server encountered an unexpected condition which prevented it from fulfilling the request.", "code":"500 Internal Server Error" } I want to receive a json with the error, to make it to parse from UI. -- Ramon Nunes Medeiros Kimchi Developer Linux Technology Center Brazil IBM Systems & Technology Group Phone : +55 19 2132 7878 ramonn(a)br.ibm.com