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RFC: Interacting with Remote Services

Simply put, REMOTE PROCEDURE call (RPC) services provide a standardized interface for making function or method calls over a network.

Virtually every aspect of Web programming contains RPCs. HTTP requests made by Web browsers to Web servers are RPC-like, as are queries sent to database servers by database clients. Although both of these examples are remote calls, they are not really RPC protocols. They lack the generalization and standardization of RPC calls; for exam­ple, the protocols used by the Web server and the database server cannot be shared, even though they are made over the same network-level protocol.
 
To be useful, an RPC protocol should exhibit the following qualities:  

• Generalized—Adding new callable methods should be easy.
•  Standardized— Given that you know the name and parameter list of a method, you should be able to easily craft a request for it.
• Easily parsable—The return value of an RPC should be able to be easily con­verted to the appropriate native data types.

HTTP itself satisfies none of these criteria, but it does provide an extremely convenient transport layer over which to send RPC requests. Web servers have wide deployment, so it is pure brilliance to bootstrap on their popularity by using HTTP to encapsulate RPC requests. XML-RPC and SOAP, the two most popular RPC protocols, are traditionally deployed via the Web and are the focus of this chapter.

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