The 500 means you've got some other problem that's not an error response by the Tableau REST API. If you check the link you've sent and scroll down a bit, you'll see the different error messages. Try to set a little delay when you do the request, just to double check if it keeps giving out that error.
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Hi Nicolas, while you may find some way to work around this (like retrying after a delay, as mentioned by Rafael), a server error means something is not quite right on the server side (in other words, it's not your fault). You might want to file a support case to get to the underlying cause: Support Case | Tableau Software.
Thanks you Jeff, as you suggested I opened a support case and will follow up in this thread.