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According to http://chemistry.apache.org/java/how-to/how-to-connect.html, some repositories send HTTP Cookies to accelerate authentication for subsequent calls. Is this true of Nuxeo?
Yes, if on subsequent requests you pass the JSESSIONID cookie you received in the login response, then the server-side HTTP session should be reused and reauthentication bypassed.
JSESSIONID
Edit: this is wrong, see other answer.
Ok the other answer is wrong. The CMIS bindings don't use HTTP sessions so don't return a JSESSIONID cookie. Please see http://answers.nuxeo.com/questions/6456/cmis-workbench-with-cookies-enabled-logs-into-nuxeo-every-time for more.