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The GraphQL spec allows for an
extensions
key to be provided in responses to allow the server to extend responses however they see fit.This change adds support for this key in responses, and allows code with access to the
RequestContext
to add values to this map using theRegisterExtension
method. The intended usage is for aRequestMiddleware
to register a value once, either at the start of a request and pass the value around, or at the end of a request. An error will be returned if a key is registered twice.The current primary use-case for this is Apollo Tracing (#219) — which this PR will assist with.