JSON Headers being wiped

[abepetrillo]

I'm using this proxy to hit the CircleCI API, and to get JSON we need to add an Accept and Content-Type header.

When I do this, the proxy seems to wipe those headers? I attempted a self hosted version, and added those heads to the allowedOriginalHeaders.json file but with no success. I've also noticed that others are not having this problem, as those headers are available when they are displaying the details in other issues.

Am I doing something wrong, or missing a configuration step?

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