Why Is My Local AJAX Request Throwing a 'Cross-Origin Requests are Only Supported for HTTP' Error?

XMLHttpRequest Cross-Origin Error

When attempting to execute AJAX requests from a local web server, developers may encounter the error "Cross origin requests are only supported for HTTP." This error occurs despite the request not being cross-domain.

Cause

This error is triggered by the browser's security policy, which restricts cross-origin communication between different domains and protocols for security reasons. However, in this case, the request is being made from a local server to a local resource, making it essentially same-origin.

Solution

To resolve this issue, Chrome users can start the browser with the following switch:

--allow-file-access-from-files

MacOS

<code class="pre">open -a 'Google Chrome' --args -allow-file-access-from-files</code>

Linux

<code class="pre">google-chrome  --allow-file-access-from-files</code>

Windows

Add the switch to the end of the "target" path in the properties of the Chrome shortcut:

<code class="pre">C:\ ... \Application\chrome.exe --allow-file-access-from-files</code>

By enabling this switch, Chrome allows AJAX requests to access local files and resources, resolving the error "Cross origin requests are only supported for HTTP but it's not cross-domain."

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