Does the owner (and the one who intervenes in the traffic) of the proxy server see the body of the request?

Question

Computer networks

The scheme is as follows:

1) Can the owner of the proxy service view the request body and its headers?
2) Can someone who intercepts the traffic between the client and the proxy service see the request body and headers?

Answer 1

1. If SSL bumping is configured on the proxy and the corresponding root certificate is installed on the client, then it can.
2. Similarly, when raising a transparent proxy and setting up the appropriate routing on the client or embedding an existing route into the chain.