Under the Hood: Transactions

like HTTP auth exchange

like HTTP server authorization

Server

Client

2

5

4

3

Tom’sE-person

Tom’s UserProfilingCommpact

Tom

Web browser

Web server

1: GET index.html

6: Result

• Case: Pre-existing relationship [no network caching]

• Specialization: HTTP Access Control scheme

1: Request: e.g. HTTP

2: Which commpact to use ?

3: Response: Use subscription

4: Request to authorize

5: Authorization Decision

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