headers test passes

Author: Ken Stevens

hapi-fhir-server/src/main/java/ca/uhn/fhir/rest/server/messaging/IMessage.java

@@ -22,9 +22,11 @@
 import ca.uhn.fhir.rest.server.messaging.json.BaseJsonMessage;
 import jakarta.annotation.Nonnull;
 
+import java.util.HashMap;
 import java.util.Map;
 import java.util.Optional;
 import java.util.UUID;
+import java.util.stream.Collectors;
 
 /**
  * This interface is implemented by serializable "wrapper" message classes that are exchanged with Massage Brokers. HAPI-FHIR
@@ -65,4 +67,9 @@ default <H> Optional<H> getHeader(String theHeaderName) {
 	 * @return the de-serialized value of the message
 	 */
 	T getPayload();
+
+	default Map<String, String> getHeadersAsStrings() {
+		return getHeaders().entrySet().stream()
+			.collect(Collectors.toMap(Map.Entry::getKey, e -> e.getValue().toString()));
+	}
 }