Cross origin requests#

To prevent remote code execution attacks modern browsers block certain requests to resources. WebGL games cannot be run directly due to these restrictions.

Resolution#

Build and run#

Unity's build and run option listed in the build settings will host a local web server to host your build, and then runs it.

Use a custom local web server#

Laragon can host a simple local web server with a suitable url.
After installing and opening Laragon:

1. Configure the document root in Laragon's preferences to a directory you would like to host your builds in.
2. Move your build and its index.html file into a folder in that directory.
3. Right-click in Laragon's interface and select ApacheStart Apache¹.
4. Open your browser and navigate to folder.test², where folder is the name of the directory you made in step 2.

Host on the web#

Services like itch.io provide free hosting for WebGL games.
Services like these are aimed at publicly hosting finished products, so it's best to use a custom local web server during development.