Github Pages with WebGL - JSON error

So I’m trying to host some demo WebGL projects using Github Pages. So far I’ve created a project, uploaded index.html alongside the Build and TemplateData folders, and added a web.config file next to index.html with the following contents:

<?xml version="1.0" encoding="UTF-8"?>
<mimeMap fileExtension=".mem" mimeType="application/octet-stream" />
<mimeMap fileExtension=".data" mimeType="application/octet-stream" />
<mimeMap fileExtension=".unity3d" mimeType="application/octet-stream" />
<mimeMap fileExtension=".memgz" mimeType="application/octet-stream" />
<mimeMap fileExtension=".datagz" mimeType="application/octet-stream" />
<mimeMap fileExtension=".unity3dgz" mimeType="application/octet-stream" />
<mimeMap fileExtension=".jsgz" mimeType="application/octet-stream" />
<mimeMap fileExtension=".unityweb" mimeType="application/octet-stream" />
<mimeMap fileExtension=".json" mimeType="application/json" />


However, on loading the project, I still get this error:

An error occurred running the Unity content on this page. See your browser JavaScript console for more info. The error was:
SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

Try as I might, I can’t seem to find a way around this. Does anyone here know what is wrong?

I don’t have the money to spend on hosting, so Github Pages is really my only option (I tried Azure, but it has a very tight bandwidth limit that I went over almost immediately), unless anyone knows of any other free web hosts.

I had the exactly same issue and i fixed it, building my game with Brotli compression Format (Inside Publishing Settings for Webgl in unity), instead of Gzip. Then you have to put this web.config for GitHub web host:
You will not need to pay for amazon or azure server :slight_smile:

                <remove fileExtension=".unityweb" />
                <mimeMap fileExtension=".unityweb" mimeType="application/octet-stream" />
                    <rule name="Append br Content-Encoding header">
                        <match serverVariable="RESPONSE_Content-Encoding" pattern=".*" />
                                <add input="{REQUEST_FILENAME}" pattern="\.unityweb$" />
                        <action type="Rewrite" value="br" />