How to Solve Cross-Origin Request Blocked Errors in Go HTTP Handlers for Firefox OS?

Cross-Origin Request Blocked Solution for Go HTTP Handlers

When encountering the "Cross-Origin Request Blocked" issue while making HTTP requests from a different origin, exploring the root cause and implementing an effective solution is essential.

In the given scenario, the Go HTTP handler handles POST requests and responds with data. However, when the request is made from a JavaScript app in Firefox OS using XMLHttpRequest, a cross-origin policy error возникает.

To resolve this issue, it is recommended to leverage the mozSystem property when creating the XMLHttpRequest object in JavaScript. Setting mozSystem to true allows cross-site connections without CORS headers. Ensure that the manifest file for the Firefox OS app includes the systemXHR permission.

var xhr = new XMLHttpRequest({mozSystem: true});

"permissions": {
       "systemXHR" : {},
}

By implementing these changes, cross-origin requests can be made and the desired response obtained.

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