No content loads on mixer.com

[jdm]

https://mixer.com/

[jdm]

 %c  %c Mixer/frontend2#216e3d19690f1469d8e37f36c0331b07f83468ed %c %c


background:#537bfe;padding:5px 0;
color:#aaa;background:#0e162a;padding:5px 0;
color:#fff;background:#86a2fe;padding:5px 0;
background:#86a2fe;padding:5px 0;

 %c  %c ATTENTION %c  %c THIS CONSOLE IS MEANT TO BE USED BY DEVELOPERS, ANY SCRIPT RAN HERE WILL HAVE FULL ACCESS TO YOUR BROWSER AND ACCOUNT: https://en.wikipedia.org/wiki/Self-XSS %c


background:#c22;padding:5px 0;
color:#aaa;background:#0e162a;padding:5px 0;
background:#e44;padding:5px 0;
color:#fff;background:#c22;padding:5px 0;
background:#e44;padding:5px 0;;
Automatic Cv management is set to "true" in config.  However, cv plugin is not available. Disabling automatic Cv management
Removing opt-out value
Reset value has been set
[2020-05-21T03:53:18Z ERROR script::dom::bindings::error] Error at https://web.vortex.data.microsoft.com/collect/v1/asm.js?ver=%272.1%27&name=%27Ms.Webi.PageView%27&time=%272020-05-21T03%3A53%3A17.652Z%27&os=%27MacOS%27&appId=%27JS%3AMixer%27&cV=%27JlZBPI1bfUCPQMSSpF5DXp.0%27&-ver=%271.0%27&-impressionGuid=%270ea54bef-b013-45c2-814d-5c735f3d39f9%27&-pageName=%27Home%27&-uri=%27https%3A%2F%2Fmixer.com%2F%27&-resHeight=1800&-resWidth=2880&-pageTags=%27%7B%22metaTags%22%3A%7B%7D%7D%27&-behavior=0&*baseType=%27Ms.Content.PageView%27&*cookieEnabled=true&*isJs=true&*title=%27Mixer%20%7C%20Interactive%20Livestreaming%27&*isLoggedIn=true&*flashInstalled=false&ext-javascript-ver=%271.1%27&ext-javascript-libVer=%274.2.9%27&ext-javascript-domain=%27mixer.com%27&ext-javascript-userConsent=false&$mscomCookies=false:1:287 awa.sendEventThroughIframe is not a function

[jdm]

Interestingly, that same JS exception appears when I load the page in Firefox.

[jdm]

I do get some content loading in the latest Servo revisions. There is now a CORS network error for https://uhf.microsoft.com/en-CA/shell/api/mscc?sitename=mixer&domain=mixer.com&&mscc_eudomain=true&country=CA. We appear to be missing a Host header in our request.

[jdm]

Nevermind, when I load mixer.com in a private window in firefox we observe the same CORS failure for the same reason (no Access-Control-Allow-Origins header in the preflight repsonse), so that's a red herring.

[jdm]

My latest investigations are focused on a missing HLS manifest. The network panel in Firefox shows an XHR for a URL that includes HlsManifest; this load is never started in Servo, and the code that leads to the load in Firefox isn't invoked according to my console logs.

[jdm]

At least one piece of code in hls.js checks for the presence of SourceBuffer and MediaSource. The lack of these interfaces prevents prevents hls.js from being used.

[jdm]

I get behaviour in Firefox that is closer to what I observe in Servo if I disable media.mediasource.enabled. The main video does not appear to load, but hovering the mouse over smaller thumbnails causes a video to play. This is controlled by a mouseenter event that calls setShowVideo.

[jdm]

Firefox is able to play individual viewing pages like https://mixer.com/ChrissiSpark with media.mediasource.enabled set to false. I intend to set some breakpoints in the HTMLMediaElement code in a debug firefox build to see whether it's still taking MSE codepaths under the hood.

[jdm]

mixer.com doesn't exist any more.