Resolved: type trait with enum as specialisation

Question:

I would like to have a type trait that would be false for any parameter T except for the enum value Http::Get
However, it seems that the c++ compiler does not allow me to specialise a template class with an enum when the first is a typename.
If I instead do :
it works!
Any reason why that is the case, and what are the workarounds to achieve what I want.
I basically want the compiler to return the type trait to false even when T is not of a enum type Http

Answer:

typename and class expect types. Http::Get is (presumably) not a type, but a value, like any other constant (42, 'A', false etc.). And you obviously cannot pass a value when a type is expected.
The solution would be different depending on your use cases. For example:

If you have better answer, please add a comment about this, thank you!