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Embark on a backend optimization journey for a mobile app, overcoming resource limitations. JSON, Protobuf, and FlatBuffers serialization protocols are scrutinized, with DIY optimization yielding significant performance boosts. Load tests showcase the efficiency of FlatBuffers, emphasizing its superiority for rapid data serialization. Uncover the importance of protocol selection in achieving optimal performance in real-world applications.

C++. I have such code: grpc::CompositeChannelCredentials(ssl_creds, StaticMetadataCredentialsPlugin::CreateCallCredentials("x-token", "12345")); In some cases, I want override "x-token" metadata for specific call, but in both following cases, it doesn't override, it adds one more metadata with the same key: ClientContext context; context.AddMetadata("x-token", "overridden"); context.set_credentials(StaticMetadataCredentialsPlugin::CreateCallCredentials("x-token", "overridden")); How to override metadata?