Conditionally set header in proxy

[Mitchell Hashimoto]

Hello,

I'm doing SSL termination in nginx, and I'd like to set a header such as
"X-Sheme https" ONLY if X-Scheme is not set. The reason is because an
upstream load balancer may have terminated SSL as well, and I don't want to
overwrite that value.

Is this possible?

Best,
Mitchell
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