multipart/mixed
transport support for deferred queries
#3341
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@defer
spec doesn't necessarily specify which request headers need to be supported, but Apollo Client injects amultipart/mixed
header whenever the query contains a@defer
directive and expects amultipart/mixed
response:Spec: https://github.com/graphql/graphql-wg/blob/e4ef5f9d5997815d9de6681655c152b6b7838b4c/rfcs/DeferStream.md
This partially solves: #3335 and #2771
I have:
Note that the response is actually wrapped in a
incremental
property because that's how the Apollo Client expects it: https://github.com/apollographql/apollo-client/blob/v3.11.8/src/link/http/__tests__/responseIterator.ts#L79-L91Example of communication (redacted few fields):