correct Content-Type to Content-Length
This page has this line
"Your response must return a 200 status code, the response body must contain the raw challenge value, and you must set the Content-Type response header to the length of the challenge value. If successful, your subscription is enabled."
I have assumed that this is meant to say "Content-Length" rather than "Content-Type", because using the challenge length as a Content-Type is not a valid content type.
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