ImBoredAllTheTime's questions

For HTTP/0.9:

GET /

For HTTP/1.0:

GET / HTTP/1.0

For HTTP/1.1:

GET / HTTP/1.1
Host: example.com

What is the request line for HTTP/2? Is it something like:

GET / HTTP/2.0

Or HTTP/2?

Is the Host: header required over SSL even if the request is not HTTP/1.1?

So, if a client connects over SSL, and sends the following request:

GET / HTTP/1.0

1. Should the web server throw a bad request due to the missing Host: header?
2. Should the web server respond with an HTTP/1.0 200 OK response?
   (the index.html file always exists, so a request to /, would never lead to 403/404)

Update:

If I disable SNI in openssl s_client, apache works without the Host: header.

Why does it need the Host: header when SNI is on?

From RFC 3912:

3. Protocol Example

If one places a request of the WHOIS server located at whois.nic.mil for information about "Smith", the packets on the wire will look like:

  client                           server at whois.nic.mil

  open TCP   ---- (SYN) ------------------------------>
             <---- (SYN+ACK) -------------------------
  send query ---- "Smith<CR><LF>" -------------------->
  get answer <---- "Info about Smith<CR><LF>" ---------
             <---- "More info about Smith<CR><LF>" ----
  close      <---- (FIN) ------------------------------
             ----- (FIN) ----------------------------->

This:

  client                           server at whois.nic.mil

  open TCP   ---- (SYN) ------------------------------>
             <---- (SYN+ACK) -------------------------

Seems like a two way TCP handshake? Which, does that exist?

I think this is what that should be mentioned:

  client                           server at whois.nic.mil

  open TCP   ---- (SYN) ------------------------------>
             <---- (SYN+ACK) -------------------------
             ---- (ACK) ------------------------------>

I think it is basically a shorthand to the three way handshake...