You said you are using Domino Access Services, but your sample URL is:
http://server/xpagesext.nsf/REST_DataService.xsp/viewEntriesPathInfo
This implies you are actually using a REST service control on an XPage. The corresponding DAS URL would be something like:
http://server/xpagesext.nsf/api/data/collections/name/AllContacts
So I just want to be sure about your request. Is it for the REST control or DAS (the data service)?
Also, what is your use case? For example, are you trying to find out when the view was last modified without fetching the data? What other HTTP response headers are you interested in?
Thanks.
-- Dave