[Plugin] Http/s REST, blueprintable JSON and Parse REST API manager at once (VaRest)

I have a huge problem with tokens and the request header.
After a successful login my server returns a valid token for future authorization.
For authorization I set a header “Authorization” and give it the token as value.

When I copy the token and pass it as a “Make Literal” String everything works finde, but when I store the token in a String variable and pass it as the header value the token is invalid.
On the server the token seems to be OK but cannot be decoded correctly.

Any ideas?