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what is xml rpc menu home xml rpc spec metaweblog api debugger validator 1998 legacy site json syntax on github what is xml rpc it s a spec and a set of implementations that allow software running on disparate operating systems running in different environments to make procedure calls over the internet it s remote procedure calling using http as the transport and xml as the encoding xml rpc is designed to be as simple as possible while allowing complex data structures to be transmitted processed and returned javascript implementation starting in 2019 there s a new implementation of xml rpc in javascript client and server for node js client for the browser pure javascript supports xml and json encoding new debugger and validation suite example code written by one of the designers of the protocol example client here s code that makes a simple xml rpc call in a node js app const xmlrpc require davexmlrpc const urlendpoint http betty userland com rpc2 const verb examples getstatename const params 5 an array containing one element the number 5 const format xml could also be json xmlrpc client urlendpoint verb params format function err data if err console log err message err message else console log json stringify data it sends a call to the demo server betty userland com the procedure it calls is examples getstatename with a single parameter the number 5 the call will be made in xml it could also use json if we know the server supports it when the server returns the callback receives the standard node error object in the first param and if there was no error the data returned through xml rpc in the second parameter example server here s the code for a simple xml rpc server const xmlrpc require davexmlrpc var config port 1417 xmlrpcpath rpc2 xmlrpc startserveroverhttp config function request switch request verb case uppercase if request params length 0 request returnval undefined request params 0 touppercase else request returnval message there must be at least one parameter return true we handled it return false we didn t handle it here s pseudo code that calls this service it returns this is a test xmlrpc localhost 1417 rpc2 uppercase this is a test simple xml rpc debugger i ve put up a simple app that lets you try calling an xml rpc procedure from an html form where you supply the url of the endpoint the verb you want to call and its parameters as a javascript expression it then displays the result in json in a box below if there s an error message it s displayed in red you can try calling these routines on betty scripting com it s the default endpoint examples getstatename params 31 examples getstatenames params 12 22 32 42 examples getstatelist params 12 22 32 42 examples getstatestruct params state1 3 state2 42 examples getstatename params 900 error nosuchname error if you open the javascript console you ll see the actual xml rpc cals in xml as they go over the wire screen shot how params work in the xmlrpcclient the third param to the xmlrpcclient function is either a value or a list of values if it s a value the xml rpc procedure is called with a single parameter if it s a list with n elements the procedure is called with n params if you want to call a procedure with a single param that s a list send a list with a single element that s the list it s the one weird case for this calling convention and is illustrated with the third call above using json in place of xml the xml rpc standard specifies using xml of course but in this implementation as an experiment you can also use json when processing a request we look at the first non whitespace character if it s a left curly brace we treat it as json not xml i haven t written a spec for the jsonified version but i have created a cribsheet with examples that i used to guide the implementation two types base64 and datetime iso8601 are represented as strings there is no way for the toolkit to know they are binary data or dates this means that the xml and json versions are not exactly the same not sure what the implications of this will be i wrote up the issue on scripting news please help test for interop if you re running xml rpc in your world could you try testing against the server i have running at betty scripting com the server is accessible through port 80 the calls it handles are exactly the ones handled by the userland version of the test server demo code that calls the actual server is provided in javascript the goal is to replace betty userland com with the one running here but only after enough testing to be confident that it makes a good reference server if you have success or find problems please post a note in the issues section here thanks how to participate i started a page at reboot xmlrpc com with links to new stuff related to this work read eric kidd s fantastic xml rpc howto test your implementation on the xml rpc validator page the original site the original site dating back to 1998 is preserved lest anyone forget the first implementation of xml rpc was in frontier in april 1998 questions comments post an issue here