1545215 - Can't silence connectionFailure error message

Status: UNCONFIRMED

(Core :: Networking: WebSockets, enhancement, P3)

Description

[dan.strokirk]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36

Steps to reproduce:

When there is a network error, Firefox always outputs the connectionFailure to the console, without allowing the user to catch those errors.

For example, run this in the console:

var ws = new WebSocket("wss://example.com")
ws.onerror = e => console.log(e)

Actual results:

Firefox shows the error:

Firefox can’t establish a connection to the server at wss://example.com/.

Expected results:

It would be great to be able to override these error logs in some way.

In some cases, I want to override the onError handler of a websocket, fetch request or XHRRequest and catch failures to provide my own, more specific, error message. I can do that with the javascript error events, but the browser error messages are always shown, which can cause noisy logs.

Comment 1

[Nicolas Chevobbe [:nchevobbe]]

Looks like we're consistent with Chrome: we throw an error AND call the onerror callback.
I'm going to redirect this to the relevant team.