Your pipeline is green, your gateway runs smooth, then someone spins up an old XML-RPC service. Suddenly, your clean REST world meets legacy remote calls wrapped in verbose payloads. If you have ever needed Kong to broker those calls safely and predictably, this post is for you. Configuring Kong XML-RPC right turns decades-old protocols into repeatable, auditable flows instead of fragile one-offs.
XML-RPC is a remote procedure standard that predates REST, making structured calls over HTTP using XML payloads. Kong, as a modern API gateway, sits between your services and the outside world. When combined, Kong XML-RPC gives you uniform routing, authentication, and logs for those old XML-based requests. It’s not pretty, but it works elegantly once you set up the right flow.
Here’s the logic. You define a Kong service representing your XML-RPC endpoint. Requests pass through the gateway, where Kong handles identity verification via OIDC or OAuth2. Then, it translates or forwards XML-RPC payloads intact to your backend system. The outcome is centralized policy enforcement without forcing legacy systems to learn modern token schemas. Permissions and rate limits stay consistent across REST and RPC endpoints. It’s modernization by stealth.
Best practice number one: keep XML parsing out of the gateway. Let Kong handle traffic control and security, not data transformation. Second, attach strict schema validation plugins if you must verify request bodies. Third, pair authentication with audit logging. XML-RPC lacks native headers for identity, so Kong’s plugin ecosystem—JWT, ACL, RBAC—fills that gap neatly. Rotate authentication secrets as often as you patch your dependencies.
Life gets easier fast.