Change:
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Is there another reliable alternative?
Just fetch the marketplace domain URL instead of trying to see if there's a network first: if it works, it works. If it doesn't, you handle that in the fetch clause and tell the user that it looks like they're having (this time real) network connectivity issues. There hasn't actually been a reason to look at since the addition of XMLHttpRequest way back when, and more recently, the Fetch API. Too many things (both in and out of the control of the user agent) can interfere with any of the properties found on .
not that I am aware of. the goal with using was to provide a better notification to users (similar to offline page in browsers) when we are confident that connectivity is offline compared to other network errors we receive from the request API. Isn't meant to give a pretty confident response about status. Atleast on macOS, chromium implements this by registering notification via api if is reachable by any network connection on the device. Refs Is there anything in your network setting that would make the above detection not work ?
I know Slack does something "clever" here, if it detects it's running in a browser that claims is it reports so maybe worth asking the Slack folks what they do? Also, while is meant to give a confident response, any number of hardware, firewall, etc. issues can invalidate it without affecting network connectivity to real IPs rather than 0.0.0.0 I'd still recommend "just try to get the URL you need" and if that doesn't work, use that as signal that we need to check what says, rather than the other way around. That way you first do the thing that, if there is network connectivity, will just work. If it doesn't, then you can check "why it might have failed" as part of the error handling (rather than the more naive "retry X times before considering it a connectivity issue" that someone might be tempted to implement in a personal project) and if that says then there's now good enough evidence to tell the user that they're offline.
seems reasonable that we move the offline status check once the request has failed to address these scenarios.

Discussion:
import { IRequestContext, IRequestOptions, OfflineError } from 'vs/base/parts/request/common/request'; export function request(options: IRequestOptions, token: CancellationToken): Promise<IRequestContext> { <del> if (!navigator.onLine) { throw new OfflineError(); } </del> if (options.proxyAuthorization) { options.headers = { ...(options.headers || {}),

setRequestHeaders(xhr, options); xhr.responseType = 'arraybuffer'; <del> xhr.onerror = e => reject(new Error(xhr.statusText && ('XHR failed: ' + xhr.statusText) || 'XHR failed')); </del> <ins> xhr.onerror = e => reject( navigator.onLine ? new Error(xhr.statusText && ('XHR failed: ' + xhr.statusText) || 'XHR failed') : new OfflineError() ); </ins> xhr.onload = (e) => { resolve({ res: {