How to Fix 'Cross-Origin Request Blocked' Errors in Firefox OS Apps Making Requests to a Go Server?

Understanding "Cross-Origin Request Blocked" in Go and Firefox OS Apps

An issue known as "Cross-Origin Request Blocked" arises when an HTTP request is denied because the destination domain is not the same as the origin of the request. This commonly occurs when making requests across different domains in web applications.

In the provided Go code, the server is attempting to allow cross-origin requests by setting the "Access-Control-Allow-Origin" header to "*," which allows requests from any domain. However, the Firefox OS application is still facing the issue.

The problem lies in the JavaScript XMLHttpRequest object used in the application. To enable cross-site connections without CORS, the "mozSystem" flag in the XMLHttpRequest constructor must be set to true.

Solution for Firefox OS App

In the provided JavaScript code, replace:

var request = new XMLHttpRequest();

with:

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

Manifest Modification

Additionally, ensure that the application's manifest includes the "systemXHR" permission:

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

By making these adjustments, the Firefox OS app will be able to make cross-origin POST requests to the Go server and retrieve the desired response.

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