Handle request errors and timeouts gracefully

[rolodato]

When any of these requests fail or time out, Lock will never finish loading and no error message is shown:

• https://TENANT.auth0.com/user/ssodata?ldaps=1&client_id=CLIENT_ID&cbx=__auth0jp0
• https://s3.amazonaws.com/assets.auth0.com/client/CLIENT_ID.js?t1411149795204

This situation should be handled and appropriate error messages should be shown.

[pose]

Aren't this issues from Auth0.js? I think that as they are JSONP requests it's going to be hard, or even impossible, to handle them properly. What we can do is add a timeout, but we will need to think a bit about it.

[jfromaniello]

The first url shown yes is from auth0.js, the second one is a request made by the widget itself.

+1 timeout

[cristiandouce]

Ok, the /ssodata/ request never returns error. It fallbacks to an empty response and also has a timeout of 3 seconds.

You can check it here: https://github.com/auth0/auth0.js/blob/master/lib/index.js#L1014-L1017

Here is an example:

The JSONP mock for the client configuration retrieved from S3, is fixed in a commit I'm about to push.

This should fix all issues related to network.

There is no timeout for the S3 request. Should we add one? /cc @jfromaniello @woloski @pose

[cristiandouce]

I added a timeout of 3 seconds to handle the error on fetching S3 data for clients.