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[java-pubsub] Allow user to configure usage of REST Transport #13049
Description
Activity
We have patched the Publisher implementation to support
InstantiatingHttpJsonChannelProvider
and verified that the same works for our use case.googleapis/java-pubsub#2075 illustrates the patch.
Please let us know whether there are any limitations in the implementation approach and
if it can be considered for general availability.Hello! Thank you for raising this concern and your proposed patch. One concern we have is that this would bring the Java client library out-of-sync with our other client libraries. Additionally, a change like this will require a significant amount of testing to ensure that the new transport type is properly supported. I will be leaving this opened for now and will update with more information in the future as plans change or this becomes a priority for this client library.
- changed the title
[-]Allow user to configure usage of REST Transport[/-][+][java-pubsub] Allow user to configure usage of REST Transport[/+]on May 8, 2026
Is your feature request related to a problem? Please describe.
The PubSub Java SDK does not work when configured with
InstantiatingHttpJsonChannelProvider.It only supports
InstantiatingGrpcChannelProvider. ThePublisherimplementationprovided by the SDK is tightly coupled with a Grpc transport.
Describe the solution you'd like
Update the Publisher and Subscriber implementations to support
InstantiatingHttpJsonChannelProviderDescribe alternatives you've considered
None
Additional context
which performs additional validation on request attributes to limit traffic to just allowlisted GCP projects
or pubsub topics