Why Do I Get a CORS Error When Loading Local HTML Files in My Browser?-JS Tutorial-php.cn

Why Do I Get a CORS Error When Loading Local HTML Files in My Browser?

Mary-Kate Olsen

Release： 2024-12-13 17:44:12

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Why Do I Get a CORS Error When Loading Local HTML Files in My Browser?

Loading Local Resources in HTML: CORS Error

When loading local HTML files, you may encounter the error "Origin null is not allowed by Access-Control-Allow-Origin." This is because of the same-origin policy (SOP) implemented in most browsers.

The SOP restricts cross-origin access to protect users' data and privacy. In this case, the local file system is considered a separate "origin" from the browser, and loading files from it directly is prohibited.

Cause of the Error

In the provided code, you are attempting to load the "weather.xsl" file into a

using jQuery's load() method. However, since "weather.xsl" is a local file, the SOP prevents the browser from accessing it.

Solution

Unfortunately, direct loading of local resources using AJAX requests is not allowed due to the SOP. Instead, consider the following solutions:

Install a local web server: Install a web server like Apache or Nginx and host the HTML file on a local server. This will give you a URL to access the file over HTTP, and the SOP will not apply.
Use a Chrome extension: There are Chrome extensions like "Allow CORS: Access-Control-Allow-Origin" that can temporarily disable the SOP for local files, allowing you to load the HTML output into the
.
Use a data URI: Convert the HTML output from "weather.xsl" into a data URI and embed it directly in the HTML page. This avoids loading the file from a different origin.

Note:

It's important to remember that these workarounds may not be suitable for all scenarios and should be used only for testing purposes. For production environments, deploying files to a web server is the recommended approach.

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