Will using proxy-protocol on a backend change behaviour on header manipulation in a frondend?

@jvwag wrote:

I have configured a frontend with some header manipulation, mostly for security:

frontend ft_web
  bind :::443 v4v6 ssl crt /etc/haproxy/certs/ alpn h2,http/1.1 curves secp384r1
  reqidel ^x-forwarded.*
  http-response set-header Strict-Transport-Security "max-age=31536000; includeSubDomains;"
  use_backend bk_group1

backend bk_group1
  server localhost1 localhost:8000 send-proxy check

In this case, the headers are not modified. But when I remove send-proxy from the backend server, and reconfigure my backend to not use the proxy protocol the header manipulations work. I added my bind to indicate I also use http/2.0.

Does the send-proxy directive manipulate the connection mode to tunnel mode?

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