If you're using Java 9, you can do something like ...

# getting-started

[marstran]

If you're using Java 9, you can do something like this:

return Optional.ofNullable(req.cookies)
               .flatmap(::extractFromCookie)
               .or {
                   Optional.ofNullable(req.header)
                           .flatMap(::extractFromHeader)
               }

The or method is new in Java 9.