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When trying to check the availability of usernames at the matrix.org server using the Matrix protocol with the following command

curl -H "Content-Type: application/json" -X GET "https://matrix.org/_matrix/client/v3/register/available?username=john" -d "{}"

or this simplified one

curl -X GET "https://matrix.org/_matrix/client/v3/register/available?username=john"

I always get the error

{"errcode":"M_UNKNOWN","error":"Server is unavailable"}

I believe I send the request according to the specification, for a version that is supported by the server. The server is clearly available, as it 1. responds to the requests above (albeit with an error) and 2. responds correctly to a version request:

curl -H "Content-Type: application/json" url -X GET "https://matrix.org/_matrix/client/versions" -d "{}"

What am I doing wrong?

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  • I'm getting HTTP status code 429 when trying that request in my browser, and according to their docs it means, "This request was rate-limited." I am getting the same JSON response as you have above though, and not the one described here, spec.matrix.org/v1.11/client-server-api/#rate-limiting - no retry_after_ms in the JSON, and no Retry-After response header either. Commented Apr 9 at 11:52
  • 1
    your request is bogus as you're doing a GET request with a json request body, but even when you fix that, the server still doesn't work. you should contact matrix.org , their api does not behave as documented wrt spec.matrix.org/v1.11/client-server-api/… Commented Apr 9 at 13:42
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