Headers are per stream, not per message. The whole stream is a single HTTP round-trip. So the first thing the server sends back are response headers. Then the response payload (which consists of zero or more messages). Finally, you get trailers.
To include metadata for each response message, you'll have to encode that into your RPC schema -- e.g. add a map<string,string> field to your response message (or whatever suits your need, the less stringly-typed likely the better). Then your server can stuff that metadata into each response message. ---- *Josh Humphries* jh...@bluegosling.com On Fri, Sep 22, 2017 at 2:36 PM, <thas.hi...@gmail.com> wrote: > > So to send header metadata with on each call we can use interceptors. Ex: > https://github.com/grpc/grpc-java/blob/166108a9438c22d06eb3b371b5ad34 > a75e14787c/examples/src/main/java/io/grpc/examples/header/ > HeaderClientInterceptor.java > > However, for bidirectional streaming case for a given stub/channel, the > headers will only be sent once (via start() call). Is there a way to have > every message after to also have the headers sent? > > I see that there is a sendMessage https://github.com/grpc/grpc-java/blob/ > 166108a9438c22d06eb3b371b5ad34a75e14787c/core/src/main/java/ > io/grpc/ServerCall.java#L128 call, but it only takes in the request > message as a parameter. So i'm wondering if there's a way to send other > parameters in the header on each subsequent message call in the stream. > > Of course, I could add the parameters to the message body, but that could > lead to a pretty large .proto definition. > > Thanks! > > -- > You received this message because you are subscribed to the Google Groups " > grpc.io" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to grpc-io+unsubscr...@googlegroups.com. > To post to this group, send email to grpc-io@googlegroups.com. > Visit this group at https://groups.google.com/group/grpc-io. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/grpc-io/32099406-cbbb-4e43-9821-9128faa34205%40googlegroups.com > <https://groups.google.com/d/msgid/grpc-io/32099406-cbbb-4e43-9821-9128faa34205%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "grpc.io" group. To unsubscribe from this group and stop receiving emails from it, send an email to grpc-io+unsubscr...@googlegroups.com. To post to this group, send email to grpc-io@googlegroups.com. Visit this group at https://groups.google.com/group/grpc-io. To view this discussion on the web visit https://groups.google.com/d/msgid/grpc-io/CAO78j%2BKi7%3D8QWS9o4X0qPgRab10%3Dt-z6gtidmLVnqQ-n%2BuHV7g%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
