headers do not work

[Saint Michael]

I keep getting this error
 *356 client sent invalid header line:
"Finagle-Ctx-com.twitter.finagle.Retries: 0" while reading client
request headers, and twitter cannot read my twitter-card
yet, I do have
underscores_in_headers on;
ignore_invalid_headers on;
in the http{} block
How do I force nginx to disregard any illegal headers?
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