For my opinion it's seems good, someone can see that's is wrong with my request ?
It seems so, yes, on the face of it.
Some implementation (?) may produce by that a SOAPAction without the quote in the HTTP header. If you're in doubt, maybe you can try also this see if it results differently...
i got this in return (with the field standalone added)
I don't think it makes any difference with or without standalone added... basically you mean the server sends the request back to the client. But, by this alone, we can't deduce at all there _must_ be a problem. It may well at the present stage of the service behave like that - at least it is not sending back a fault message?! What the service should return is promised by its wsdl and it is where
you should look into.
Furthermore, I am doubtful any prolog is actually sent or received or what you posted are actually edited version you think what should be. Actually, no prolog should actually be sent back and forth.