Facing issue in passing headers and other request from one external proc to another external proc using custom filter

[yogeshsolanki7]

Hi Team,

I am facing one issue related to the calling and passing values from one external proc to another external proc.
If i am calling one external proc from envoy then its sending "ProcessingRequest.getRequestCase() == REQUEST_HEADER" which is perfect.
But when I added one more external proc with custom filter then my next external proc is getting ""ProcessingRequest.getRequestCase() == RESPONSE_HEADER". which is wrong for my .. I need ""ProcessingRequest.getRequestCase() == REQUEST_HEADER"" on both external proc.

Envoy --> External Proc (REQUEST_HEADER) ---- This is my old one and now introduced one more external proc.

Envoy --> External Proc -- A (REQUEST_HEADER) ---> External Proc -- B (RESPONSE_HEADER) ---- This is happening currently
Envoy --> External Proc -- A (REQUEST_HEADER) ---> External Proc -- B (REQUEST_HEADER) ---- Expecting with all the request header as like earlier one.

Please help.

Here is code ..

public HttpFilter produce(ListenerBuildConfig config) {
return HttpFilter.newBuilder()
.setName(EXT_PROC_START_AUDIT_ORDER)
.setTypedConfig(Any.pack(
ExternalProcessor.newBuilder()
.setGrpcService(GrpcService.newBuilder()
.setEnvoyGrpc(GrpcService.EnvoyGrpc.newBuilder()
.setClusterName(CLUSTER_NAME)
.build())
.setTimeout(Duration.newBuilder().setSeconds(5).build())
.build())
.setAllowModeOverride(true) // This is required to override the static processing mode
.setObservabilityMode(true)
.setProcessingMode(ProcessingMode.newBuilder()
.setRequestHeaderMode(ProcessingMode.HeaderSendMode.SEND)
.setResponseHeaderMode(ProcessingMode.HeaderSendMode.SEND)
.setRequestBodyMode(ProcessingMode.BodySendMode.STREAMED)
.setResponseBodyMode(ProcessingMode.BodySendMode.STREAMED)
.setRequestTrailerMode(ProcessingMode.HeaderSendMode.SKIP)
.setResponseTrailerMode(ProcessingMode.HeaderSendMode.SKIP)
.build())
.build()
)
)
.build();
}

[ggreenway]

cc @yanavlasov @yanjunxiang-google

[yanjunxiang-google]

HI, @yogeshsolanki7 ,
I have a couple questions:

1. Could you please clarify what this mean: "when I added one more external proc with custom filter"? Are you writing a custom ext_proc filter and using it as above External Proc -- B?
2. Could you please share your Envoy configuration, and Envoy trace logs including logs from External Proc -- B?

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[github-actions]

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