@demobox this is an issue in any case where we send Expect: 100-continue but do not receive HTTP/1.1 100 Continue, for example in this signed URL test, but also in other scenarios such as Swift reauthentication #104 where we want to consume the 401 response.  Note that this is a Java 7 problem specifically, not a jclouds problem, but we need to deal with it.  @diwakergupta has discussed offline stripping Expect: 100-continue by default and letting users opt into this behavior if their service shows benefit from this, such as AWS-S3.