reverse proxy: connect to origin servers via http or https?

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Hello,

I have a reverse proxy (apache 2.2) with mod_proxy_balancer with https visible to the outside world.

The question is: from the proxy performance/scalability point of view is it better to configure backends (origin servers) with http or with https?

Is it true that if proxy is setup https->http then it only has to decrypt/encrypt the headers and the body is encrypted/decrypted on the backend? I do not use mod_proxy_html (but maybe there are other modules which affect this behaviour on the proxy?. 

How either setup affects latency of handling requests? With https->https do I have to do two handshakes (on the proxy and on the backend) for every connection? I have KeepAlive both on the proxy and the backends.

Many thanks.

Best regards,

kuba

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