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Pro PHP Security: From Application Security Principles to the Implementation of XSS Defenses, Second Edition by Thomas Myer, Michael Southwell, Chris Snyder

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RPC and Web Services

A remote procedure call typically consists of a command and a number of arguments. The arguments may be simple, like the path to a file, or complex, like a MIME message or a structured list in XML or some other format.

The requested action is carried out by the server with the data supplied in the arguments, and a response message is returned to the requestor. Like the request, the response can be extremely simple, as in an HTTP response code, or arbitrarily complex.

Both request and response must conform to a mutually agreed upon application programming interface (API). The interface specifies the format of requests, including the names of actions and the arguments they expect. It also defines the format of responses and ...

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