Set SNI based on the Host header on the outgoing TLS connections

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6

You need to clarify:

Does your backend server 10.0.0.135 on port 91 support the binary proxy-v2 protocol? If not, you need to remove send-proxy-v2.

Is your backend server 10.0.0.135 on port 91 actually SSL enabled? If not, there is no way to send SNI.

Again, if you want to access the HTTP headers (like with req.hdr(host)) you are required to switch it all to http mode (replace mode tcp with mode http).