Add optional operationTypeHeader to Apollo client options#163
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finnhodgkin merged 4 commits intoJun 4, 2026
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When set, HTTP requests carry the GraphQL operation type (query/mutation) as the value of the given header, so a load balancer can route queries to a read replica. Opt-in via new createClient'/createSubscriptionClient'; existing constructors are unchanged.
finnhodgkin
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Jun 4, 2026
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Summary
Adds an opt-in
operationTypeHeader :: Maybe Stringoption to the Apollo base clients. When set, HTTP requests carry the GraphQL operation type (queryormutation) as the value of the given header, so infrastructure (e.g. a load balancer) can route queries to a read replica.createClient'/createSubscriptionClient'constructors takingApolloClientOptions'/ApolloSubClientOptions'with the extra field.createClient/createSubscriptionClientare unchanged (they delegate withNothing), so this is fully backwards compatible.When the option is not set, behaviour is identical to before (no extra header).
🤖 This PR was generated by an AI agent (Claude Code) on behalf of Justin Garcia.