Incorrect error reporting when using link preload

[valodzka]

Describe the bug
Incorrect error reported "Browser errors were logged to the console"

To Reproduce

1. Run web.dev audit with 'https://condescending-haibt-2d0d42.netlify.com/bug.html' (page uses link: </empty.js>; rel="preload"; as="script"; crossorigin="anonymous" header)

2. In the report there are incorrect error "Browser errors were logged to the console":

   /empty.js(condescending-haibt-2d0d42.netlify.com) | Failed to load resource: net::ERR_ACCESS_DENIED
   

Expected behavior
There should not be such error

Report: https://lighthouse-dot-webdotdevsite.appspot.com//lh/html?url=https://condescending-haibt-2d0d42.netlify.com/bug.html

[wardpeet]

Web.dev does indeed give you the failed to load resource error. CLI seems to be working correctly & audit panel in chrome too.

The cli gives me an error of a missing favicon.

[connorjclark]

Thanks for the report @valodzka i'll check it out.

@wardpeet the favicon is a separate issue - we run headless chrome which will never request a favicon. we've removed favicon from perf budgets #10190 but we should also go a bit further I think ... can you open an issue for this? I'd expect the favicon request to not even be made ...

[connorjclark]

@valodzka that's weird! could you add a second js file (and also preload it), but give it some content in the body? just console.log('hi'); is enough. curious if the response body being empty matters (it probably doesn't but I wanna rule it out).

I see it is blocked b/c of CSP.

devtools log:

 {
      "method": "Network.requestWillBeSent",
      "params": {
        "requestId": "99.14",
        "loaderId": "FA85E2BBFA7F81CF38584B9238265CE1",
        "documentURL": "https://condescending-haibt-2d0d42.netlify.com/bug.html",
        "request": {
          "url": "https://condescending-haibt-2d0d42.netlify.com/empty.js",
          "method": "GET",
          "headers": {
            "Referer": "https://condescending-haibt-2d0d42.netlify.com/bug.html",
            "Origin": "https://condescending-haibt-2d0d42.netlify.com"
          },
          "mixedContentType": "none",
          "initialPriority": "High",
          "referrerPolicy": "no-referrer-when-downgrade",
          "isLinkPreload": true
        },
        "timestamp": 295580.719805,
        "wallTime": 1582840710.451049,
        "initiator": {
          "type": "other"
        },
        "type": "Script",
        "frameId": "42EB25EC22BCF905D8B8F8FA777DBDDA",
        "hasUserGesture": false
      }
    },
    {
      "method": "Network.loadingFailed",
      "params": {
        "requestId": "99.14",
        "timestamp": 295580.71981,
        "type": "Script",
        "errorText": "",
        "canceled": false,
        "blockedReason": "csp"
      }
    },

which seems wrong ... it's the same origin. That may be our bug.

[valodzka]

give it some content in the body?

Added. Empy or not it doesn't matter.

[patrickhulce]

P1.5 because this seems like a legit PSI infra bug that deserves to be looked into.

---

edit by paul: it's possible #7163 is related?