Current implementation always uses POST as the transport mechanism. Adding GET support enables usage of GET queries for caching simply via URL. Some notes: - I left the existing API for creating a new client as is, but the implementation could be much cleaner by introducing some sort of configuration struct when creating a new client - The construction of the query parameters follows the logic from Apollo's client implementation, which can be found here https://github.com/apollographql/apollo-client/blob/8beb4820edc6352996e08f7f73bde3573f1eb666/src/link/http/rewriteURIForGET.ts - Updated integration tests to use both sets of clients. Updating the tests to use a test suite would be cleaner