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Outlined here: https://github.com/vector-im/riot-web/issues/3605#issuecomment-298679388 ```HTTP GET /_matrix/.../register/available { "username": "desiredlocalpart123" } ``` If available, the response looks like ```HTTP HTTP/1.1 200 OK { "available": true } ``` Otherwise, ```HTTP HTTP/1.1 429 { "errcode": "M_LIMIT_EXCEEDED", "error": "Too Many Requests", "retry_after_ms": 2000 } ``` or ```HTTP HTTP/1.1 400 { "errcode": "M_USER_IN_USE", "error": "User ID already taken." } ``` or ```HTTP HTTP/1.1 400 { "errcode": "M_INVALID_USERNAME", "error": "Some reason for username being invalid" } ```