brownhci/WebGazer

Uncaught (in promise) TypeError: failed to fetch

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#260 opened on Jun 2, 2022

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help wanted

Description

I am trying to run webgazer from an old portable Chromium version (61) on an offline computer (yes, I know it's an odd use case).

When I run the sample webgazer.setGazeListener code from https://webgazer.cs.brown.edu/ I get the error in the title. I am running this on a page served from a local Node.js server. The server doesn't use HTTPS by default, but I thought that might not matter since this is such an old version of Chromium (i.e. before various APIs started only working on secure origins).

I get a prompt to allow access to the webcam (an attached Logitech C920 since it's a desktop), which I allow, but the error still appears. Based on the code at the line number mentioned in the error stack trace (line 148496) it seems like there's an issue getting the stream from the webcam. But the webgazer face overlay canvas is created and I can see myself. However the setGazeListener does not run (doesn't print elapsed time as in example).

Contributor guide

Tech stack
javascript
Domain
frontendmachine learning
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
JavaScriptWeb APIs (fetch, getUserMedia)WebGazer libraryBrowser version compatibility
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Investigate the error 'failed to fetch' in the WebGazer codebase at the referenced stack trace line (likely around getUserMedia). Check if the issue is caused by using insecure HTTP on an old Chromium version that may enforce secure context for camera access. Review the fetch() call and consider adding error handling for older browsers. Look at the existing comments on the issue for additional context.
Uncaught (in promise) TypeError: failed to fetch · brownhci/WebGazer#260 | Good First Issue