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NGINX returns 502 when Proxied Response Header Name Contains Whitespace - 6 months ago

Hi, NGINX is returning an HTTP 502 when the Upstream Header Name contains whitespace. The following error message is recording in the error log. upstream sent invalid header: "IIS\x20..." while reading response header from upstream The request is returned successfully from the Upstream Server with the headers listed below. Cache-Control: Content-Length: Content-Type: Server: