What's the standard for XML-RPC fault codes?

Question

In the process of writing a pingback handler for my website, I noticed that the XML-RPC specification doesn't say anything about what fault codes should be defined and what they should mean. So the question is, is there a commonly accepted standard for fault codes that specifies this information? Which fault codes are defined and what do they mean? Both for XML-RPC in general, and for specific applications (like pingback)?

I think I know an answer to this but I'd like to get the community's input on it (and I think it's good reference material to have on SO).

Answer 1

XML-RPC doesn't define fault codes because that's an application level definition. XML-RPC is just a carriage format: It specifies data, it doesn't specify what's in the data. Fault codes are generally server-specific.

That said, general uses of XML-RPC may have some standard fault codes, and you'd do well to look them up because I'd imagine there are some for something as widespread as pingbacks.

Answer 2

http://xmlrpc-epi.sourceforge.net/specs/rfc.fault_codes.php seem to be widely accepted.