Although there are many differences between Graphql APIs and common REST APIs implemented with HTTP, I am wondering if these differences are syntactical or if Relay and Graphql are fundamentally non-RESTful. If so which constraint of REST do they violate?
GraphQL is not RESTful as it doesn't use uris and http methods to express the nature of the operations. You have one route (for example: /graphql) that you send all operations to - both queries and mutations, on all types of entities.
来源：https://stackoverflow.com/questions/38709614/are-relay-and-graphql-restful