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+---
+labels:
+summary: 'Test account credentials using HTTP'
+...
+
+Introduction
+------------
+
+This module lets you test whether a set of credentials are valid,
+using Prosody's configured authentication mechanism.
+
+This is useful as an easy way to allow other (e.g. non-XMPP) applications
+to authenticate users using their XMPP credentials.
+
+Syntax
+------
+
+To test credentials, issue a simple GET request with HTTP basic auth:
+
+    GET /auth_check HTTP/1.1
+    Authorization: Basic <base64(jid:password)>
+
+Prosody will return a 2xx code on success (user exists and credentials are
+correct), or 401 if the credentials are invalid. Any other code may be returned
+if there is a problem handling the request.
+
+### Example usage
+
+Here follows some example usage using `curl`.
+
+    curl http://prosody.local:5280/data/accounts -u user@example.com:secr1t