Lesson 09 · 11 min
The client: fetch, cache, and updates
A GraphQL request is an ordinary POST. The rest is client-library convenience.
The simplest client is fetch: a POST to /graphql with JSON { query, variables }. The response often has status 200 even with errors, so check both res.ok and the errors field. Libraries like Apollo Client or urql add a cache: they normalize responses by __typename + id, so a book updated by a mutation changes at once in every list on the page.
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