Each params element includes a list of param elements which in turn contain value elements.įor example, to pass a request to a method called circleArea, which takes a Double parameter (for the radius), the XML-RPC request would look like: The methodName element identifies the name of the procedure to be called, while the params element contains a list of parameters and their values. Each methodCall element contains a methodName element and a params element. Information identifying which procedure is being called, while the HTTP headers provideĪ wrapper for passing the request over the Web.Įach request contains a single XML document, whose root element is a methodCallĮlement. The XMLĬontent uses the data typing structure to pass parameters and contains additional XML-RPC requests are a combination of XML content and HTTP headers. This way you can implement almost all data types supported by any programming language. The following array contains four integers:Īrrays can also contain mixtures of different types, as shown here:Ĭreating multidimensional arrays is simple - just add an array inside of an array: For example, the following arraycontains four strings: Like other data types, the array element must be enclosed in a value element. Arrays represent sequential information, while structs represent name-value pairs, much like hashtables, associative arrays, or properties.Īrrays are indicated by the array element, which contains a data element holding the list of values. These basic types may be combined into two more complex types, arrays, and structs. Strings (and only strings) may be enclosed in a value element but omit the string element. These basic types are always enclosed in value elements. Basic Data Types in XML-RPC Typeģ2-bit integers between - 2,147,483,648 and 2,147,483,647.ĪSCII text, though many implementations support Unicodeīonkers! in ISO8601 format: CCYYMMDDTHH:MM:SSīinary information encoded as Base 64, as defined in RFC 2045 The XML-RPC specification defines six basic data types and two compound data types that represent combinations of types. We will study all these three components in the next three chapters. XML-RPC response structures : An HTTP response that contains return values or fault information.
XML-RPC request structures : An HTTP POST request containing method and parameter information. XML-RPC data model : A set of types for use in passing parameters, return values, and faults (error messages). XML-RPC consists of three relatively small parts: XML-RPC's most obvious field of application is connecting different kinds of environments, allowing Java to talk with Perl, Python, ASP, and so on. XML-RPC offers integrators an opportunity to use a standard vocabulary and approach for exchanging information. XML-RPC is an excellent tool for establishing a wide variety of connections between computers. If you need to integrate multiple computing environments, but don't need to share complex data structures directly, you will find that XML-RPC lets you establish communications quickly and easily.Įven if you work within a single environment, you may find that the RPC approach makes it easy to connect programs that have different data models or processing expectations and that it can provide easy access to reusable logic.
Xml rpc client software#
XML-RPC emerged in early 1998 it was published by UserLand Software and initially implemented in their Frontier product. With XML-RPC and web services, however, the Web becomes a collection of procedural connections where computers exchange information along tightly bound paths. XML-RPC has no notion of objects and no mechanism for including information that uses other XML vocabulary. XML-RPC parameters are a simple list of types and content - structs and arrays are the most complex types available. XML-RPC client specifies a procedure name and parameters in the XML request, and the server returns either a fault or a response in the XML response. XML-RPC uses a small XML vocabulary to describe the nature of requests and responses. XML-RPC uses the HTTP protocol to pass information from a client computer to a server computer. XML-RPC permits programs to make function or procedure calls across a network. XML-RPC is among the simplest and most foolproof web service approaches that makes it easy for computers to call procedures on other computers. These interfaces can be as simple as a single function call or as complex as a large API. Effectively, RPC gives developers a mechanism for defining interfaces that can be called over a network. RPC is a much older technology than the Web. As its name indicates, it is a mechanism to call a procedure or a function available on a remote computer.
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