XML-RPC
Business Profile
Core Value Proposition
XML-RPC provides a simple, cross-platform remote procedure calling protocol that enables software on different operating systems and environments to invoke procedures over the Internet via HTTP using XML encoding.
Target Customer
Software developers and IT teams needing cross-language RPC over HTTP; developers building or consuming XML-RPC/MetaWeblog APIs and related tooling (Node.js and browser clients are mentioned).
Key Differentiator
A historical, simple RPC protocol designed for easy implementation across environments, with explicit support for complex data structures, an experimental JSON encoding variant, and integrated debugging/validation tooling.
Implementation Timeline
Not specified; the protocol emphasizes ease of implementation and testing, suggesting potential for rapid value delivery.
Pain Points
- 1Need for interoperable remote procedure calls across diverse environments and languages
- 2Desire for a lightweight, easy-to-implement protocol compatible with CGI/HTTP infrastructure
- 3Requirement for a firewall-friendly RPC mechanism that relies on standard HTTP POST with XML
Key Features
- 1HTTP POST transport with XML encoding for RPC calls
- 2Supports complex data structures (struct, array) and various scalar types
- 3Optional JSON encoding variant (experimental) for interop
- 4Debugger and validation tooling, example code, reference client/server implementations
- 5Legacy and ongoing specification dating back to 1998, with related APIs (e.g., MetaWeblog API)
Target Customer Industries
Competitive Advantages
- 1Cross-environment interoperability across disparate systems
- 2Simple and easy to implement design
- 3Firewall-friendly approach using standard HTTP POST with text/xml
- 4Ability to transmit complex data structures and a range of data types
- 5Supporting tooling (debugger/validator) and example code to accelerate adoption
Key Benefits
Additional Product Information
Product Description
A protocol and set of implementations that enable remote procedure calls over the Internet using HTTP as the transport and XML as the encoding, with support for multiple data types and structures; includes JavaScript/Node.js implementations and an experimental JSON variant, along with debugging/validation tools.
Target Market
Developers and organizations requiring cross-language RPC capabilities over HTTP, particularly those building or consuming XML-RPC or MetaWeblog API integrations.
Unique Value Proposition
A lightweight, interoperable RPC protocol that is easy to implement across environments, supports complex data structures, and includes practical tooling and an experimental JSON encoding option.
Technical Requirements
HTTP POST with Content-Type: text/xml; payload is an XML-RPC <methodCall> containing <methodName> and <params> with <param><value> types; supports types such as i4/int, boolean, string, double, dateTime.iso8601, base64, struct, and array; 32-bit integers; forward-compatible with the option to include a JSON-encoded variant by inspecting the first non-whitespace character.
Pricing Model
Royalty-free: Any party may implement this protocol for commercial or non-commercial purposes without royalty or license fees to UserLand.
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