@Override
    public String toString() {
        return MoreObjects.toStringHelper(this).omitNullValues()
                          .add("clientRequestContext", clientRequestContext)
                          .add("httpRequest", httpRequest)
                          .toString();
    }
The {@link HttpRequest} associated with this {@link Context}.
core/src/main/java/com/linecorp/armeria/client/observation/ClientObservationContext.java