Why Does My Local HTML File Generate an 'Origin null is not allowed' Error When Using jQuery?

Error: "Origin null is not allowed by Access-Control-Allow-Origin"

When attempting to load an HTML output file (weather.xsl) into a div element using jQuery, an error occurs stating that the origin is not allowed. This issue stems from loading the webpage via a local file URL (e.g., file:///).

Cause:

Most browsers enforce the Same Origin Policy for local files, which prohibits loading any resources from outside the same directory as the document. In this case, loading the weather.xsl file from a local file system makes it inaccessible.

Possible Solution:

Since JavaScript with local resources is often restricted, it is recommended to use a simple web server to test the code. By deploying the files via HTTP URLs, you can obtain a more accurate security picture. Integrated development environments (IDEs) often provide built-in web servers or extensions that allow you to run and serve the files effortlessly.

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