[jira] [Created] (CALCITE-5189) Add support for constant HTTP path prefixes to Avatica server

["Will Noble (Jira)" <ji...@apache.org>]

Will Noble created CALCITE-5189:
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             Summary: Add support for constant HTTP path prefixes to Avatica server
                 Key: CALCITE-5189
                 URL: https://issues.apache.org/jira/browse/CALCITE-5189
             Project: Calcite
          Issue Type: New Feature
          Components: avatica
            Reporter: Will Noble
            Assignee: Will Noble


Some load balancers, such as those based on [Kubernetes ingress rules|https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.19/#httpingressrulevalue-v1beta1-networking-k8s-io], can only route requests based on HTTP path. To support hosting an Avatica server behind such a load balancers, the driver should support prepending all HTTP request paths with a constant (configurable) prefix, and the server should support stripping that constant prefix from all requests is receives.

On the server side, this can either be done as a piece of middleware (A handler wrapper that just strips the prefix then delegates to the real handler), or by modifying the existing 2 handlers ({{AvaticaProtobufHandler}} and {{AvaticaJsonHandler}}) to ignore the prefix (without duplicating code). I'm leaning toward the former, since it would obviate the need to worry about it in any custom / future handlers.



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