Why Does My jQuery XSLT Call Fail with 'Origin null is not allowed by Access-Control-Allow-Origin'?

Same Origin Policy and Access-Control-Allow-Origin Error

When attempting to load HTML output from an XSLT file via jQuery, the "Origin null is not allowed by Access-Control-Allow-Origin" error arises. This error stems from the Same Origin Policy (SOP), which restricts file loading from URLs not sharing the same origin as the loading document.

In this case, the HTML file making the jQuery call is attempting to load the XSLT file from the local file system, using a file:/// URL. Browsers have strict SOP enforcement for local files, disallowing any resource loading from other local files or directories.

Resolution

To rectify this issue, it is crucial to avoid loading resources via local file URLs and instead utilize a web server to serve both the HTML and XSLT files via HTTP URLs. By using a web server, you can establish a common origin between the files, allowing the jQuery call to succeed without violating the SOP.

Most modern IDEs incorporate built-in web servers that can be launched alongside codeexecution. Alternatively, third-party web servers, such as Apache or Nginx, can be installed for local testing.

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