Sync failed because of TypeError: Failed to fetch

[bwindels]

should have been converted to a ConnectionError?
This is in Chromium Version 83.0.4103.116 (Developer Build) Fedora Project (64-bit)

[bwindels]

fwiw, this is expected in the service worker and can show up in the logs like this.

[bwindels]

I wonder if this can be caused by there being a network but CORS failing, (or even a non 2xx response?)

Seeing this:

The FetchEvent for "https://matrix.org/_matrix/client/r0/sync?since=...&timeout=30000&filter=..." resulted in a network error response: the promise was rejected.
sw.js:1 Uncaught (in promise) TypeError: Failed to fetch
matrix.org/_matrix/client/r0/sync?since=...&timeout=30000&filter=...:1 Failed to load resource: net::ERR_FAILED

[bwindels]

Matthew saw this as well on Tuesday:

[bwindels]

Wild ideas as to what could cause this that may or may not make sense:

• Unlikely: some usage of request outside of HomeServerApi, like for downloading attachments is causing this, and somehow it ends up in the promise for sync.

We should test while being offline (simulated, real) and see if we can reproduce.

[luke2m]

I have this on iOS safari 14, it shows up in a green bar at the top of the screen. (Not sure if this helps or even is related)
Sync failed because of TypeError: null is not an object (evaluating 'this._roomEncryption.getEventIdsForMissingKey') will test on Linux tomorrow

[luke2m]

No issue on Gnome Web 3.38.2 and Chrome 88.0.4324.182 (Both on Arch Linux x86_64)

[bwindels]

@luke2m You were hitting a bug that got introduced with 0.1.33 and fixed in 0.1.34

[bwindels]

just ran into this again on chrome 88, the status bar in the app said Sync failed because of TypeError: Failed to fetch, and the logs showed the same:

{
          "s": 0,
          "d": 659,
          "v": {
            "t": "network",
            "url": "https://matrix.org/_matrix/client/r0/sync?since=m1881256857~1.1881256861_redacted&timeout=30000&filter=5",
            "method": "GET"
          },
          "l": 6,
          "e": {
            "stack": "TypeError: Failed to fetch",
            "name": "TypeError",
            "message": "Failed to fetch"
          }
        }

I'm not sure if the server actually went offline as the client had stopped syncing for at least 30 min

[bwindels]

Just hit this, it happened just after the homeserver was restarted.