Security and authentication in web services

Posted by King on Stack Overflow See other posts from Stack Overflow or by King
Published on 2010-04-19T22:16:45Z Indexed on 2010/04/20 0:13 UTC
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web-services

Lets say we have a website that uses a web service for all of its functionality (i.e. retrieving and updating data from/to db), how does the web service authenticate requests?

As I understand it, in a traditional java "website" a user provides a username & password, and upon validation a jsessionid is assigned to the user (client browser). Every time the client browser asks the website for something, the site checks for the jsessionid ensuring that the user is registered and authenticated. Is there a web services equivalent of this? If yes, what?

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