Howto Remove the Cache-Control request header.

[Vincent Blondel]

Hello,
We want nginx to remove the request header Cache-Control before to proxy
the request to the OCS.
We do like this ...

location /xxx {
        more_set_headers 'Strict-Transport-Security: max-age=31622400;
includeSubDomains';
        more_set_headers 'X-XSS-Protection: 1; mode=block';
        more_set_headers 'X-Content-Type-Options: nosniff';
        proxy_read_timeout 120s;
        proxy_set_header Connection "";
        proxy_set_header via "HTTP/1.1 $hostname:443";
        proxy_set_header Host $host;
        proxy_set_header Cache-Control "";
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_ssl_certificate /etc/nginx/keys/xxx.pem;
        proxy_ssl_certificate_key /etc/nginx/keys/xxx.key;
        proxy_pass https://XXX;
        proxy_redirect http:// https://;
        proxy_next_upstream error timeout invalid_header http_503;
}

but the request header Cache-Control is still being sent to the OCS.

Thank You in advance for Your help.
Sincerely,
Vincent
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