Hello,

We have gotten our first jclouds/S3 app up and running using a combination
of the general and provider specific APIs.  I have a question about blob
signatures that I hope someone might be able to help me with.

I'm familiar with the standard method for getting a blob request signature:

    signer = context.getSigner();
    request = signer.signGetBlob(bucket, key);

This produces a standard HttpRequest object with method, endpoint, and
headers: date and authorization.  However, on an object where I've defined
a content disposition (via BaseMutableContentMetadata and the
setContentDisposition on payload.setContentMetadata()), I was hoping that
the signature would (or could be made to) include the
"response-content-disposition=attachment; filename=" in the HttpRequest
response.  However, I don't see a way to do this.

I did find the RequestAuthorizeSignature class which provides methods that
would allow me to build the HttpRequest myself, adding the
response-content-disposition, and to sign that request appropriately in
order to build the authorization.  However, RequestAuthorizeSignature looks
to be an internal class and not something that I can readily use.

What is the appropriate way in jclouds to incorporate the
response-content-disposition in a blob request signature so that when a
non-java client retrieves the resource, it will download with the provided
file name?

V/r,

Jeremy

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