How to Fix 'Cross origin requests are only supported for HTTP' Errors When Loading Local Files with Three.js?

Loading Local Files with Three.js: Troubleshooting Cross Origin Requests

When attempting to load a local 3D model into Three.js using JSONLoader, you may encounter the "Cross origin requests are only supported for HTTP." error. This error arises due to the difference in protocol between your local file and the web browser.

Cause of the Error

This error occurs because browsers restrict cross-origin requests by default. They prevent websites from accessing resources from different origins for security reasons. When loading a local file from your computer, the browser considers it to have a different origin than your website, which is typically served over HTTP.

Fixing the Error

To resolve this error, you have two options:

1. Install a Local Webserver:

   • Install a webserver on your local computer, such as XAMPP or Apache, and host your 3D model on the server.
   • Change the URL of the JSONLoader to the path of the model on your webserver.

2. Upload the Model Remotely:

   • Upload your 3D model to a remote server, such as GitHub, AWS S3, or a free hosting service.
   • Update the URL of the JSONLoader to the remote URL.

Understanding Origins

Origins are defined as combinations of scheme, host, and port. In this case, the scheme (HTTP/file), host (localhost), and port (typically 80) differ. As stated in RFC-6454: "...they have the same scheme, host, and port." Therefore, even though the file originates from the same host, the different scheme results in a different origin.

By following these solutions, you can successfully load local 3D models into Three.js and avoid the "Cross origin requests are only supported for HTTP." error.

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