how to launch unity WebGL on browser - unity3d

I build on unity successfully
if I run and build on unity it works
but when I run index.html on browser from build folder;
first it has been blocked by CORS policy I created a chrome shortcut disables security
then I got
Uncaught ReferenceError: unityFramework is not defined at HTMLScriptElement.n.onload
I looked into it and some said that to disable compression but I got more errors:
dont know much about webGL and not sure if its a problem on unity or browser
pls help
ps:my unity version is 2020.1.0f1

Browsers won't load javascripts (.js files) from a file system directly. You have to host them on a server. Running the server on your local machine is fine (it's what Unity does).

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Here's the error that pops out.
I've tried removing firewalls and CORS from my web browsers and its not working. Was wondering if WebGL from Unity does not support these kinds of connections.

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Everything works fine in the Editor, but after I build and run the app I get the following error on a black screen :
I don't even know where to debug this, as the only log I get is this error and nothing else. I also tried delayed initialization, but this same behavior happens when I manually call VuforiaAppllication.Instance.Initialize(); after it's initialized and before it's started.
Here's my build settings :
I'm using Unity 2020.3.30f1 and Vuforia 10.2.5, the only target SDK installed on my system is 10.0.19041.0 and also, I have Visual Studio 2019 Community installed if that info helps.
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I wanted to create a WebGL game with Unity. So i created my version of the game, i built it and works just fine in the localhost that unity launches after the build, but when i upload it in my web server, the game and the debug tool of chrome give me the following errors:
What helped me was changing compression format to Gzip and enabling Decompression fallback.
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Check your decompression settings. Sites like itch.io don't support Brotli compression, so you'll have to set it to fallback. If that doesn't work, try disabling the decompressions settings.
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Could not load file or assembly 'Facebook.Unity.Canvas'

I'm using facebook sdk 7.18.0 with Unity.
When I Build And Run, it opens in a browser window and this error is shown.
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But when I run the unity project by clicking the Play button, it works fine.
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My Ionic app works fine on browser but does not open in my phone

my ionic project works fine with ionic serve --lab ,but while copied the.apk file in build folder to my phone and install the app but blank screen appears ,
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Have you tried running it in the emulator ? Since its much easier to see the error logs . Try ionic emulate android -l or ios -l (whichever OS you are building for) and then once the execution starts run the command consolelogs it will log all the activity and you will have a better understanding about why its not working.
+1 for using Chrome Remote Debugging feature. It give you the same output as you would receive from running you app in the browser.
Additionally, I have found that sometimes if your app is already compiled, the ionic CLI doesnt always copy your current files into the APK, and uses the older cached files instead. If you are banging your head against the wall, run the following commands to make sure you have your latest code in your APK.
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I suggest you use the Chrome Remote Debugging feature. I encountered the same, and looked for answers to my symptom for hours. Once I connected to the chrome remote debugger, I got the console.log back, and noticed there was a problem in my routing setup.
It was a problem with ionic CLI. I've updated it to the latest and reinstalled all dependencies.