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Implement proper server-side streaming for `application/grpc-web+proto` content-type
See original GitHub issueAs mentioned in the README, the grpcweb mode only supports unary method calls. It should at the very least also support server streaming calls.
Issue Analytics
- State:
- Created 5 years ago
- Reactions:1
- Comments:10 (2 by maintainers)
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@jared2501 Yes, we are working on this.
Binary streams support hasn’t been a priority for us as we use a yet-to-be-published text based encoding format for protobuf. Also cookie domains can’t serve binary data due to security issues.
The main use case to support fetch is to run grpc-web from service workers. The buffering issue is definitely a concern too.
OTOH, long-lived server-push will have other issues to deal with, e.g. keep-alive. We plan to publish a spec for this soon.
I’d be really interested in seeing a fetch implementation, even if it requires some sort of flag to select. Afaik XHR will keep the full response in-memory as long as the request is in progress, therefore for long-lived server streaming methods (such as subscription-style notifications endpoints) grpc-web is untenable.
We’re using improbably-eng’s grpc-web fetch transport and it works great. Would move over to code from this repository as soon as there’s a fetch implementation!