Redirect HTTP to HTTPS with HAProxy

blog20201005-01.cfg

frontend mywebsite
    mode http
    bind :80
    bind :443 ssl crt /etc/ssl/certs/ssl.pem
    default_backend servers

blog20201005-02.pem

-----BEGIN PRIVATE KEY-----
MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICAQC...
-----END PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
MIIFuzCCA6OgAwIBAgIJAIhmZV5h/C6CMA0GCSqGSIb3DQEBCwU...
-----END CERTIFICATE-----

blog20201005-03.cfg

http-request set-header X-Forwarded-Proto https if { ssl_fc }
http-request set-header X-Forwarded-Proto http if !{ ssl_fc }

blog20201005-04.cfg

frontend mywebsite
    mode http
    bind :80
    bind :443 ssl crt /etc/ssl/certs/ssl.pem
    http-request redirect scheme https unless { ssl_fc }
    default_backend servers

blog20201005-05.cfg

http-request redirect scheme https code 301 unless { ssl_fc }