lighthouse: PROTOCOL_TIMEOUT (Method: Page.getAppManifest)

Provide the steps to reproduce

Run LH on https://seo4.net or https://krakowskakancelaria.pl/

What is the current behavior?

Error: Lighthouse returned error: PROTOCOL_TIMEOUT. Waiting for DevTools protocol response has exceeded the allotted time. (Method: Page.getAppManifest) (PROTOCOL_TIMEOUT)

What is the expected behavior?

No errors.

Environment Information

Affected Channels: Pagespeed API returns 500, web.dev and pagespeedinsights return issue.
Lighthouse version: ?
Node.js version: ?
Operating System: ?

Extra info

Issues started to occur since thursday, no action were performed on website, we tried modifying appmanifest but it doesn’t seem to be the issue as it is valid and working. ~100 other websites we are tracking regularly do have manifest and they work fine.

About this issue

Original URL
State: closed
Created 5 years ago
Reactions: 2
Comments: 17 (4 by maintainers)

Most upvoted comments

Dug in a bit more. A page can actually use WebSockets (although a connection will always fail). The issue looks to be the long polling. I made a minimal repro here: http://uninterested-badge.surge.sh/index4.html

Without the manifest file, PSI runs fine (no protocol timeout). With the manifest file, it times out.

internal bug: b/124008171

connorjclark on Feb 6, 2019