Thanks, But now i've a new status code "406 Not acceptable". In Task Result : "failureDumpAvailable" : true , "objectId" : "112000000158" , "objectName" : "Failures for Import 158" , "successful" : true the end of the url to obtains the dump : /processes/118000000053/tasks/A6B904C19C47452FA73B64385D9DEF5D/dumps/112000000158" ,
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