Github user GJL commented on a diff in the pull request:

    https://github.com/apache/flink/pull/6069#discussion_r190605670
  
    --- Diff: 
flink-clients/src/main/java/org/apache/flink/client/program/rest/RestClusterClient.java
 ---
    @@ -314,7 +319,8 @@ public JobSubmissionResult submitJob(JobGraph jobGraph, 
ClassLoader classLoader)
     
                log.info("Requesting blob server port.");
                CompletableFuture<BlobServerPortResponseBody> portFuture = 
sendRequest(
    -                   BlobServerPortHeaders.getInstance());
    +                   BlobServerPortHeaders.getInstance(),
    +                   EmptyMessageParameters.getInstance());
    --- End diff --
    
    This is not needed. There should be an overload of `sendRequest` that does 
it.


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