JSESSIONID is the name of the tracking parameter defined by the Java servlet API.
JSESSIONID is the name of the tracking parameter defined by the Java servlet API. The parameter can either be set as a cookie or as part of the url.
If a request specifies a JSESSIONID, the server will use it if it determines if it is valid. If the JSESSIONID in the request is missing or invalid, the server generates a new unique one.
Sessions can be configured to time out (usually 30 minutes) after which time the session id is no longer valid.
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