Doubt regarding graphql client

[Clasherzz]

Does this graphql client only support sending graphql queries. Is there any way it supports headers , params , json at the same time. I was doing a project and was wondering if this package is all that would be enough for me to send all this(in special cases i would have to send json and params).

[Clasherzz]

okay upon reading example documentation i cam to know we can send headers through a HttpLink object. But still has doubt regarding the rest.