I responded to your question on Gitter <https://gitter.im/grpc/grpc?at=6135c52799b7d97528f4d46b>. I said:
I don't think I understand. You are wanting to get CUSTOM_HEADER_KEY's
> "customRespondValue" within sendPing()?
It is really weird that the service would want to read response headers. So
I didn't think I understood your objective.
On Sun, Sep 5, 2021 at 1:08 PM Ashish Srivastava <aksrivastav...@gmail.com>
wrote:
> Hi Team,
> i am very new in GRPC. I have created a service and i want to get the
> header in my service. I have added the server intercepter but not able to
> get my header in below service.
>
> Can any one help ?
>
> @Override
> public void sendPing(Ping pingRequest, StreamObserver<Pong>
> pongResponseObserver){
> Pong pong= null;
> try {
> pong = createPongResponse(pingRequest);
> } catch (ServiceException e) {
> logger.log(Level.WARNING,"Error in PingPong Service");
> Metadata metadata = trailersFromThrowable(e);
> pongResponseObserver.onError(FAILED_PRECONDITION
> .asRuntimeException(metadata));
> }
> pongResponseObserver.onNext(pong);
> pongResponseObserver.onCompleted();
> }
>
>
> in metadata i am passing below json and in debugging mode it's visible in
> interceptor
> {
> "userId":"srivastava"
> }
>
> Interceptor code:
>
> public class HeaderServerInterceptor implements ServerInterceptor {
>
> private static final Logger logger = Logger.getLogger
> (HeaderServerInterceptor.class.getName());
>
> @VisibleForTesting
> static final Metadata.Key<String> CUSTOM_HEADER_KEY =
> Metadata.Key.of("custom_server_header_key", Metadata.
> ASCII_STRING_MARSHALLER);
>
> @Override
> public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
> ServerCall<ReqT, RespT> call,
> final Metadata requestHeaders,
> ServerCallHandler<ReqT, RespT> next) {
> logger.log(Level.WARNING,"header received from client:" + requestHeaders);
> return next.startCall(new
> ForwardingServerCall.SimpleForwardingServerCall<ReqT, RespT>(call) {
> @Override
> public void sendHeaders(Metadata responseHeaders) {
> responseHeaders.put(CUSTOM_HEADER_KEY, "customRespondValue");
> super.sendHeaders(responseHeaders);
> }
> }, requestHeaders);
> }
> }
>
>
>
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