CORS implementation

After hours of struggling with syntax errors, support helped identify a correction I'll pass along.

1) I wasn't able to define the class inside of the iRule and had to create a Data Group object (type: string) that contained the allowed origins as String with a blank value.

If the though of using a GUI brings a tear to your eye, here's the CLI:

ltm data-group internal DG-CORS-ALLOWED-ORIGINS {
    records {
        .authorizeddomain.com { }
        localhost:3456 { }
    }
    type string
}

2) The syntax in OP's iRule required the addition of more brackets.

This lines gives me an error: /Common/IRULE-CORS:10: error: [parse error: PARSE syntax 228 {syntax error in expression " class match [HTTP::header Origin] ends_with allowed_origins...": variable references require preceding $}][{ class match [HTTP::header Origin] ends_with allowed_origins }]

if { class match [HTTP::header Origin] ends_with DG-CORS-ALLOWED-ORIGINS }

Enclosed class in brackets and received no syntax errors:

if { [class match [HTTP::header Origin] ends_with DG-CORS-ALLOWED-ORIGINS] }

This was tested in LTM 11.6.0