curl -H 'authorization: Bearer abc123' http://127.0.0.1:8000/one{"answer":42}# curl http://127.0.0.1:8000/two{"answer":42,"foo":"foo"}# curl http://127.0.0.1:8000/three{"answer":42,"foo":"foo","bar":"bar"}

## Sharing Between Contexts[​](#sharing-between-contexts "Direct link to Sharing Between Contexts")

Each context in the prior example inherits _only_ from its parent contexts. Parent contexts cannot access entities within their descendant contexts. If needed, encapsulation can be broken using [fastify-plugin](https://github.com/fastify/fastify-plugin), making anything registered in a descendant context available to the parent context.

To allow `publicContext` access to the `bar` decorator in `grandchildContext`, rewrite the code as follows:

'use strict'const fastify = require('fastify')()const fastifyPlugin = require('fastify-plugin')fastify.decorateRequest('answer', 42)// authenticatedContext omitted for clarityfastify.register(async function publicContext (childServer) { childServer.decorateRequest('foo', 'foo') childServer.route({ path: '/two', method: 'GET', handler (request, response) { response.send({ answer: request.answer, foo: request.foo, bar: request.bar }) } }) childServer.register(fastifyPlugin(grandchildContext)) async function grandchildContext (grandchildServer) { grandchildServer.decorateRequest('bar', 'bar') grandchildServer.route({ path: '/three', method: 'GET', handler (request, response) { response.send({ answer: request.answer, foo: request.foo, bar: request.bar }) } }) }})fastify.listen({ port: 8000 })

Restarting the server and re-issuing the requests for `/two` and `/three`:

curl http://127.0.0.1:8000/two{"answer":42,"foo":"foo","bar":"bar"}# curl http://127.0.0.1:8000/three{"answer":42,"foo":"foo","bar":"bar"}