Reason: CORS header 'Origin' cannot be added

{{HTTPSidebar}} 

Reason

Reason: CORS header 'Origin' cannot be added

What went wrong?

The {{Glossary("user agent")}}  was unable to add the required {{HTTPHeader("Origin")}}  header to the {{Glossary("HTTP")}}  request. All CORS requests must have an Origin header.

This can happen if the JavaScript code is running with enhanced privileges allowing it access to multiple domains’ content, for example.

See also

• CORS errors
• Glossary: {{Glossary("CORS")}} 
• CORS introduction