1. Reload the web page. ... 
2. Clear your browser's cache. ... 
3. Delete your browser's cookies. ... 
4. Troubleshoot as a 504 Gateway Timeout error instead. ... 
5. Contacting the website directly is another option. ... 
6. Come back later.        

The 500 Internal Server error could be caused by an error during the execution of any policy within Edge or by an error on the target/backend server. The HTTP status code 500 is a generic error response. It means that the server encountered an unexpected condition that prevented it from fulfilling the request.