› curl --insecure -vvv --http1.0 https://localhost:8443
* Rebuilt URL to: https://localhost:8443/
*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8443 (#0)
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/cert.pem
  CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Client hello (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS change cipher, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-CHACHA20-POLY1305
* ALPN, server accepted to use http/1.1
* Server certificate:
*  subject: C=US; ST=Oregon; L=beaverton; CN=localhost; emailAddress=xxxx
*  start date: Apr  2 22:31:09 2019 GMT
*  expire date: May  2 22:31:09 2019 GMT
*  issuer: C=US; ST=Oregon; L=beaverton; CN=localhost; emailAddress=xxxx
*  SSL certificate verify result: self signed certificate (18), continuing anyway.
> GET / HTTP/1.0
> Host: localhost:8443
> User-Agent: curl/7.54.0
> Accept: */*
>
< HTTP/1.1 426 Upgrade Required
< date: Tue, 30 Apr 2019 22:49:24 GMT
< server: envoy
< content-length: 0
<
* Connection #0 to host localhost left intact

› curl --insecure -vvv --http1.0 https://localhost:8443
* Rebuilt URL to: https://localhost:8443/
*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8443 (#0)
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/cert.pem
  CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Client hello (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS change cipher, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-CHACHA20-POLY1305
* ALPN, server accepted to use http/1.1
* Server certificate:
*  subject: C=US; ST=Oregon; L=beaverton; CN=localhost; emailAddress=xxxx
*  start date: Apr  2 22:31:09 2019 GMT
*  expire date: May  2 22:31:09 2019 GMT
*  issuer: C=US; ST=Oregon; L=beaverton; CN=localhost; emailAddress=xxxx
*  SSL certificate verify result: self signed certificate (18), continuing anyway.
> GET / HTTP/1.0
> Host: localhost:8443
> User-Agent: curl/7.54.0
> Accept: */*
>
* HTTP 1.0, assume close after body
< HTTP/1.0 404 Not Found
< date: Tue, 30 Apr 2019 22:50:29 GMT
< server: envoy
< connection: close
< content-length: 0
<
* Closing connection 0
* TLSv1.2 (OUT), TLS alert, Client hello (1):