EnricoMi commented on PR #8306:
URL: https://github.com/apache/hadoop/pull/8306#issuecomment-4223930708

   Adding this to `hadoop-tools/hadoop-aws/src/test/resources/log4j.properties`
   ```
   log4j.logger.software.amazon.awssdk.thirdparty.org.apache.http.headers=DEBUG
   ```
   shows request headers:
   ```
   2026-04-10 10:43:27,384 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onRequestSubmitted(133)) - 
http-outgoing-0 >> GET 
/vast-bucket?list-type=2&delimiter=%2F&max-keys=2&prefix=test%2F HTTP/1.1
   2026-04-10 10:43:27,384 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onRequestSubmitted(136)) - 
http-outgoing-0 >> Host: vast.company.org
   2026-04-10 10:43:27,384 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onRequestSubmitted(136)) - 
http-outgoing-0 >> amz-sdk-request: attempt=1; max=2
   2026-04-10 10:43:27,385 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onRequestSubmitted(136)) - 
http-outgoing-0 >> User-Agent: Hadoop 3.6.0-SNAPSHOT aws-sdk-java/2.35.4 
md/io#sync md/http#Apache ua/2.1 api/S3#2.35.x os/Linux#5.15.0-91-generic 
lang/java#17.0.18 md/OpenJDK_64-Bit_Server_VM#17.0.18+8-Ubuntu-122.04.1 
md/vendor#Ubuntu md/en_GB m/F,N,N,G hll/cross-region
   2026-04-10 10:43:27,385 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onRequestSubmitted(136)) - 
http-outgoing-0 >> x-amz-content-sha256: UNSIGNED-PAYLOAD
   2026-04-10 10:43:27,385 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onRequestSubmitted(136)) - 
http-outgoing-0 >> X-Amz-Date: 20260410T094327Z
   2026-04-10 10:43:27,385 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onRequestSubmitted(136)) - 
http-outgoing-0 >> x-amz-delete-contents: true
   2026-04-10 10:43:27,385 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onRequestSubmitted(136)) - 
http-outgoing-0 >> Connection: Keep-Alive
   2026-04-10 10:43:28,389 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onResponseReceived(122)) - 
http-outgoing-0 << HTTP/1.1 400 Bad Request
   2026-04-10 10:43:28,390 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onResponseReceived(125)) - 
http-outgoing-0 << x-amz-bucket-region: vast
   2026-04-10 10:43:28,390 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onResponseReceived(125)) - 
http-outgoing-0 << Content-Type: application/xml
   2026-04-10 10:43:28,390 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onResponseReceived(125)) - 
http-outgoing-0 << Transfer-Encoding: chunked
   2026-04-10 10:43:28,391 [setup] DEBUG http.headers 
(LoggingManagedHttpClientConnection.java:onResponseReceived(125)) - 
http-outgoing-0 << Server: vast 5.4.3.1
   2026-04-10 10:43:29,402 [setup] DEBUG s3a.Invoker 
(Invoker.java:retryUntranslated(474)) - List vast-bucket:/test/ delimiter=/ 
keys=2 requester pays=null ; 
software.amazon.awssdk.services.s3.model.S3Exception: Invalid Argument 
(Service: S3, Status Code: 400, Request ID: 30d1310001aac2, Extended Request 
ID: 30d1310001aac2) (SDK Attempt Count: 1), 
   2026-04-10 10:43:29,402 [setup] DEBUG s3a.S3ARetryPolicy 
(S3ARetryPolicy.java:shouldRetry(318)) - Retry probe for AWSBadRequestException 
with 0 retries and 0 failovers, idempotent=true, due to 
org.apache.hadoop.fs.s3a.AWSBadRequestException: List 
playpen-enricmin222:/test/ delimiter=/ keys=2 requester pays=null on /: 
software.amazon.awssdk.services.s3.model.S3Exception: Invalid Argument 
(Service: S3, Status Code: 400, Request ID: 30d1310001aac2, Extended Request 
ID: 30d1310001aac2) (SDK Attempt Count: 1):InvalidArgument: Invalid Argument 
(Service: S3, Status Code: 400, Request ID: 30d1310001aac2, Extended Request 
ID: 30d1310001aac2) (SDK Attempt Count: 1)
   org.apache.hadoop.fs.s3a.AWSBadRequestException: List vast-bucket:/test/ 
delimiter=/ keys=2 requester pays=null on /: 
software.amazon.awssdk.services.s3.model.S3Exception: Invalid Argument 
(Service: S3, Status Code: 400, Request ID: 30d1310001aac2, Extended Request 
ID: 30d1310001aac2) (SDK Attempt Count: 1):InvalidArgument: Invalid Argument 
(Service: S3, Status Code: 400, Request ID: 30d1310001aac2, Extended Request 
ID: 30d1310001aac2) (SDK Attempt Count: 1)
        at 
org.apache.hadoop.fs.s3a.S3AUtils.translateException(S3AUtils.java:271)
        at org.apache.hadoop.fs.s3a.Invoker.retryUntranslated(Invoker.java:481)
        at org.apache.hadoop.fs.s3a.Invoker.retryUntranslated(Invoker.java:431)
        at 
org.apache.hadoop.fs.s3a.S3AFileSystem.listObjects(S3AFileSystem.java:3106)
        at 
org.apache.hadoop.fs.s3a.S3AFileSystem.s3GetFileStatus(S3AFileSystem.java:4096)
        at 
org.apache.hadoop.fs.s3a.S3AFileSystem.innerGetFileStatus(S3AFileSystem.java:3987)
   ...
   ```


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