Resource	Study.Roster.Role
Method	PUT
Purpose	Update permissions for an existing roleholder for a study
Client sends …		Request	PUT role-URI
		Header	Host: host
		Header	Date: date
		Header	Authorization: yosokumo user-identifier:request-digest
		Header	Content-Type: content-type
		Header (optional)	Content-Encoding: content-encoding
		Header (optional)	Content-Length: content-length
		Header (optional)	Content-MD5: content-digest
		Header (optional)	Accept: content-type(s)
		Entity	<role document>
Server returns …	Success	Code	204 No Content
		Header	Date: date
	Success (administrative privileges required by owner-roleholder not changed)	Code	200 OK
		Header	Date: date
		Header	Content-Type: content-type
		Header (conditional)	Content-Encoding: content-encoding
		Header (conditional)	Content-Length: content-length
		Header	Content-MD5: content-digest
		Entity	<message document>
	• Authorization header malformed • Put document not well-formed • Put document length does not match Content-Length header value • Put document digest does not match Content-MD5 header value • Put document not a role	Code	400 Bad Request
	Authorization header missing	Code	401 Unauthorized
		Header	WWW-Authenticate: yosokumo user:digest
	• Requesting user not recognized • Request digest incorrect • Requesting user lacks PUT role permission for this study	Code	403 Forbidden
	Requested URI not recognized	Code	404 Not Found
	• User referenced in role document conflicts with role-URI • Study referenced in role document conflicts with role-URI	Code	409 Conflict
	• Data interchange format of posted document not recognized • Encoding of posted document not recognized	Code	415 Unsupported Format