Why Am I Getting 'Cross Origin Requests are Only Supported for HTTP' When Loading Local 3D Models?

Error: "Cross Origin Requests are Only Supported for HTTP" When Loading Local File

While attempting to load a 3D model into Three.js using JSONLoader, users may encounter the error "Cross origin requests are only supported for HTTP." This issue arises when local files are accessed using non-HTTP protocols.

Cause of the Error

The error message accurately states that cross-origin requests are only supported for HTTP. However, the cause stems from the fact that local files are typically loaded using either "file://" or "C:/" protocols. As per RFC-6454, origin is defined by the scheme, host, and port. In this case, even though the file and website reside on the same host (e.g., localhost), the difference in scheme (file / http) marks them as being from different origins.

Solutions

To resolve the issue, there are two possible approaches:

1. Install a Local Web Server:

Install a local web server, such as Apache or Nginx, on your computer. Then, configure the web server to host the 3D model and access it using the "http://" protocol. This ensures that the file is loaded using the same origin as the website.

2. Upload the Model to an External Host:

Alternatively, upload the 3D model to a third-party hosting service, such as Google Cloud Storage or Amazon S3. This allows you to access the file using an HTTP-formatted URL (e.g., "http://example.com/path/to/model").

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