Several XML-RPC servers provide built-in methods. These aren't part of XML-RPC itself, but they make handy add-ons.
Edd Dumbill proposed the following set of methods:
array system.listMethods () string system.methodHelp (string methodName) array system.methodSignature (string methodName)
If a server supports these methods, you can ask it to print out some documentation:
import xmlrpclib server = xmlrpclib.Server("http://xmlrpc-c.sourceforge.net/api/sample.php") for method in server.system.listMethods(): print method print server.system.methodHelp(method) print
These methods are currently supported by servers written in PHP, C and Microsoft .NET. Partial introspection support is included in recent updates to UserLand Frontier. Introspection support for Perl, Python and Java is available at the XML-RPC Hacks page. Please feel free to add introspection support to other XML-RPC servers!
Various client-side tools (documentation generators, wrapper generators, and so on) can be found at the XML-RPC Hacks page as well.
If you're writing an XML-RPC client which makes lots of small function calls, you may discover that your round-trip time is fairly high, thanks to Internet backbone latency. Some servers allow you to batch up multiple requests using the following function:
array system.multicall (array calls)
You can find more information in the system.multicall RFC.
This method is currently supported by servers written in C and UserLand Frontier. Servers written in Python and Perl can use the code at the XML-RPC Hacks page.
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