S3Proxy can mock large objects for testing purposes. During single or multi-part PUTs S3Proxy will create a stub object containing its length. Subsequent GETs will return an object of the correct length but with NUL bytes. This mocking is not complete; listing objects and parts will return zero instead of the actual size and the Content-MD5 is incorrect. An example properties file:

s3proxy.endpoint=https://localhost:8081
s3proxy.authorization=aws-v2
s3proxy.identity=local-identity
s3proxy.credential=local-credential
s3proxy.null-blobstore=true
jclouds.provider=transient
jclouds.identity=remote-identity
jclouds.credential=remote-credential