started := time.Now()
				dl, _ := ctx.Deadline()
				if testing.Verbose() {
					fmt.Println(GetCaller(ctx).Name, "Server deadline:", time.Until(dl))
				}
				<-ctx.Done()
				serverCanceled <- time.Since(started)
				if testing.Verbose() {
					fmt.Println(GetCaller(ctx).Name, "Server Context canceled with", ctx.Err(), "after", time.Since(started))
				}
				return nil
			},

Sample handler:
```go
    handler :=  func(ctx context.Context, payload []byte, in <-chan []byte, out chan<- []byte) *RemoteErr {
        fmt.Println("Got request with initial payload", p, "from", GetCaller(ctx context.Context))
        fmt.Println("Subroute:", GetSubroute(ctx))
        for {
            select {
            case <-ctx.Done():
                return nil
            case req, ok := <-in:

type RemoteClient struct {
	Name string
}

type (
	ctxCallerKey   = struct{}
	ctxSubrouteKey = struct{}
)

// GetCaller returns caller information from contexts provided to handlers.
func GetCaller(ctx context.Context) *RemoteClient {
	val, _ := ctx.Value(ctxCallerKey{}).(*RemoteClient)
	return val
}

java.util.Map allCallers; private IvyNode node; public void IvyNodeCallers(IvyNode); public final void addCaller$687b35de(String, IvyNode, String, String[], org.apache.ivy.core.module.descriptor.DependencyDescriptor); public final IvyNodeCallers$Caller[] getCallers(String); public final IvyNodeCallers$Caller[] getAllRealCallers(); public final java.util.Collection getAllCallersModuleI(); final void updateFrom(IvyNodeCallers, String, boolean); public final IvyNode getDirectCallerFor(org.apache.ivy.core.module.id.ModuleId);...