Browsers only expect one value for access-control-allow-origin and will deny access in the presence of both headers. Select the Inspect or Inspect Element option to pull up your browser's developer tools.ĭouble CORS errors occur when your origin server and StackPath are both setting an access-control-allow-origin header for your content. Right-click or Command-Click (for Mac) anywhere on your web page.It can even be done within your web browser, just follow these steps: Troubleshooting CORS headers is easy and requires no special tools. Restrictive CORS Policy - where the browser expects only one domain to have access to the content and a different domain is trying to access it.Double CORS headers - where the browser is only expecting one value for the CORS header but is receiving two.Missing CORS headers - where the browser is denying permission to view these contents because there is no Cross-Origin Resource Sharing header. This can be caused by one of three issues: These usually manifest themselves by missing asset icons in place of stylesheets, fonts, or actual icons. Misconfigured CORS Headers can lead to missing fonts or broken JavaScript assets. Cross-Origin Resource Sharing (CORS) is a mechanism that uses additional HTTP headers to tell a browser to let a web application running at one origin (domain) have permission to access selected resources from a server at a different origin. See examples of CORS Headers that are missing fonts or stylesheets and how to easily correct these issues with our helpful guide.įor security reasons, web browsers will prevent JavaScript code from making requests to a different domain (also known as the origin) than the one it's hosted on.
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