[Error] XMLHttpRequest cannot load <OUR BOSH URL> due to access control checks

louisputter · February 12, 2023, 11:33pm

Hello,

Thank you so much for your amazing work! I hope you’ll be able to assist me.

We’ve done extensive testing after installing Jitsi and everything is working 100%, except using Jitsi in Safari on an iPhone, over a 4G or 5G network.
Everything is 100% when we switch the same iPhone to WiFi.

We get this error in Safari’s console on the iPhone:

[Error] XMLHttpRequest cannot load due to access control checks.
d (lib-jitsi-meet.min.js:2:669386)
_processRequest (lib-jitsi-meet.min.js:2:669520)
_throttledRequestHandler (lib-jitsi-meet.min.js:2:671402)
_onIdle (lib-jitsi-meet.min.js:2:666243)
_onIdle (lib-jitsi-meet.min.js:2:655823)

We believe the error might be caused by network throttling on the 4G or 5G network?
We reviewed all the Access-Control-Allow-Origin posts and don’t think this is relevant to our problem.

We tested 4 different iPhones - same behavior.
The same test cases are working on Android devices.

Any help will be highly appreciated.

Thank you so much.
Kind regards

Louis

saghul · February 13, 2023, 1:02pm

That’s unlikely, the BOSH endpoint doesn’t generate that much traffic.

louisputter · February 13, 2023, 10:59pm

Hi @saghul

Thank you for your reply.
Do you know what “access control checks” are being done in the "_throttledRequestHandler (lib-jitsi-meet.min.js) ?

It is really strange that we only get this error on Safari, on an iPhone (various models), only on a mobile network. It is working well as soon as we switch to a WiFi network. I know you can configure networks to be “metered” networks ie. pay per MB.
This is the only obvious difference that I can spot.

Please let me know if you can think of anything to investigate, else I may do a total clean re-install.

damencho · February 13, 2023, 11:47pm

This code is in a dependency we use it is not in lib-jitsi-meet code:

github.com

strophe/strophejs/blob/6b2608469bd5926fa97a5d4899e6f2b76f240263/src/bosh.js#L879


      
              clearTimeout(this._conn._idleTimeout);
          }
          
          
/** PrivateFunction: _throttledRequestHandler
           *  _Private_ function to throttle requests to the connection window.
           *
           *  This function makes sure we don't send requests so fast that the
           *  request ids overflow the connection window in the case that one
           *  request died.
           */
          _throttledRequestHandler () {
              if (!this._requests) {
                  Strophe.debug("_throttledRequestHandler called with " +
                                "undefined requests");
              } else {
                  Strophe.debug("_throttledRequestHandler called with " +
                                this._requests.length + " requests");
              }
          
          
    if (!this._requests || this._requests.length === 0) {
                  return;

louisputter · February 14, 2023, 12:05am

Hi @damencho

Thank you for the reply. I also reviewed the .js code.

It must be one of the layers higher up that gives the “[Error] XMLHttpRequest cannot load due to access control checks.” error message, which we can see in the Safari console (only when on a mobile network).

Given that no one seems to be getting this exact error, I’ll do a full re-deployment and re-test end-to-end.
I must be missing a config setting somewhere.

damencho · February 14, 2023, 12:14am

Do you reproduce the same on meet.jit.si?

louisputter · February 14, 2023, 12:54am

Hi @damencho

Good point - I’ll try this on our server overnight when I can play with the config.

damencho · February 14, 2023, 1:00am

Nope, just test it on meet.jit.si do you reproduce it there.

louisputter · February 14, 2023, 1:22am

Apologies, thought you suggested to change the BOSH URL.

I’ve done a test on meet.jit.si - it is working 100%

I’ll do a full re-deployment on my server. I must have done something wrong.
I’ve upgraded several versions over the years and I think that one of my .js files is out of date.

Thank you for your help.