jClouds not using AWS S3 V4 signature for Frankfurt region

                BlobStoreContext context = ContextBuilder.newBuilder("aws-s3")
                        .credentials("XXXXXXXXXXX", "YYYYYYYYYYYYYYYYYYY")
                        .buildView(BlobStoreContext.class);
           
                // Access the BlobStore
                BlobStore blobStore = context.getBlobStore();
                Location loc = new LocationBuilder().scope(LocationScope.REGION)
                        .id("eu-central-1")
                        .description("region")
                        .build();

                // Create a Container
                blobStore.createContainerInLocation(loc, containername);

                // Create a Blob
                File input = new File("sample.txt");
                long length = input.length();
                // Add a Blob
                Blob blob = blobStore.blobBuilder(objectname).payload(Files.asByteSource(input)).contentLength(length)
                        .contentDisposition(objectname).build();

                // Upload the Blob
                String eTag = blobStore.putBlob(containername, blob);

2016-03-08 14:57:57,044 DEBUG [jclouds.wire] [main] >> "Test[\n]"
2016-03-08 14:57:57,045 DEBUG [jclouds.headers] [main] >> PUT https://testcontainer3.s3-eu-central-1.amazonaws.com/file1 HTTP/1.1
2016-03-08 14:57:57,045 DEBUG [jclouds.headers] [main] >> Expect: 100-continue
2016-03-08 14:57:57,045 DEBUG [jclouds.headers] [main] >> Host: testcontainer3.s3-eu-central-1.amazonaws.com
2016-03-08 14:57:57,045 DEBUG [jclouds.headers] [main] >> Date: Tue, 08 Mar 2016 09:27:50 GMT
2016-03-08 14:57:57,045 DEBUG [jclouds.headers] [main] >> Authorization: AWS AKIAISCW6DRRITWR6IWQ:6AndVHQV2w75OXQDq/9sWt37KN0=
2016-03-08 14:57:57,045 DEBUG [jclouds.headers] [main] >> Content-Type: application/unknown
2016-03-08 14:57:57,045 DEBUG [jclouds.headers] [main] >> Content-Length: 5

org.jclouds.http.HttpResponseException: Server rejected operation connecting to PUT https://testcontainer3.s3-eu-central-1.amazonaws.com/file1 HTTP/1.1
at org.jclouds.http.internal.BaseHttpCommandExecutorService.invoke(BaseHttpCommandExecutorService.java:118)
at org.jclouds.rest.internal.InvokeHttpMethod.invoke(InvokeHttpMethod.java:90)
at org.jclouds.rest.internal.InvokeHttpMethod.apply(InvokeHttpMethod.java:73)
at org.jclouds.rest.internal.InvokeHttpMethod.apply(InvokeHttpMethod.java:44)