我需要在一个Android的grpc客户端中添加自定义头信息,但是我无法成功地发送它。
public class HeaderClientInterceptor implements ClientInterceptor {
@Override
public < ReqT, RespT > ClientCall < ReqT, RespT > interceptCall(MethodDescriptor < ReqT, RespT > method,
CallOptions callOptions, Channel next) {
return new SimpleForwardingClientCall < ReqT, RespT > (next.newCall(method, callOptions)) {
@Override
public void start(Listener < RespT > responseListener, Metadata headers) {
/* put custom header */
Timber.d("header sending to server:");
Metadata fixedHeaders = new Metadata();
Metadata.Key < String > key =
Metadata.Key.of("Grps-Matches-Key", Metadata.ASCII_STRING_MARSHALLER);
fixedHeaders.put(key, "primary.secondary");
headers.merge(fixedHeaders);
super.start(new SimpleForwardingClientCallListener < RespT > (responseListener) {
@Override
public void onHeaders(Metadata headers) {
/**
* if you don't need receive header from server,
* you can use {@link io.grpc.stub.MetadataUtils attachHeaders}
* directly to send header
*/
Timber.e("header received from server:" + headers.toString());
super.onHeaders(headers);
}
}, headers);
}
};
}
}
编辑:使用以下方法成功添加了自定义标头
现在,在我的grpc调用中,我是这样调用的:
ClientInterceptor interceptor = new HeaderClientInterceptor();
Channel channel = ManagedChannelBuilder.forAddress(BuildConfig.HOST, BuildConfig.PORT).build();
Channel channelWithHeader = ClientInterceptors.intercept(channel, interceptor);
ServiceGrpc.ServiceBlockingStub service = ServiceGrpc.newBlockingStub(channelWithHeader);
我已经构建了上述请求,并在伪调用中按照以下方式进行调用。
Iterator<Model> dataItems = service.getItems(SOMERequestBuilderObj);
我正在尝试添加一个自定义标头,格式如下:
"Grps-Matches-Key : primary.secondary"
在Rest API调用中,我将其作为标头添加。builder.header("Grps-Matches-Key", "primary.secondary");
希望这可以帮到您。
MetadataUtils.newAttachHeadersInterceptor(metadata)
一起使用。 - kza