chrome开发人员工具显示的HTTP协议不正确？

Question

I am checking the http protcol in use for this site http://www.dlf.in/ Chrome developer tools shows it to be http/1.1 as in the image below.

However the command line tool is-http2 or alpn in python as seems to indicate the http/1.1 is not available. And only http1 is available. What's going on here?

I am doing the ALPN negotiation in python as follows (openssl version : OpenSSL 1.0.2h and python version 3.5.1)

import ssl
import socket

port = 443
domain = 'www.dlf.in'

ctx = ssl.create_default_context()
ctx.set_alpn_protocols(['h2', 'spdy/3.1', 'spdy/3', 'spdy/2', 'http/1.1'])


conn = ctx.wrap_socket(socket.socket(socket.AF_INET, socket.SOCK_STREAM),
        server_hostname=domain)

conn.connect((domain, port))
print(conn.selected_alpn_protocol())

Answer 1

That site doesn't have HTTPS on it. Browsers only support HTTP/2 over HTTPS despite the spec allowing it over HTTP in theory.

Answer 2

Using telnet and HTTPie to send HTTP requests (both 1.0 and 1.1), the web server responds with:

HTTP/1.1 200 OK

I tried it with 2.0 and got:

HTTP/1.1 505 HTTP Version Not Supported

Answer 3

This site doesn't support SSL (I tried using using curl https://www.dlf.in and got the HTTP 504 response)

Curl is a command line browser that also implements HTTP/2 in clear (non SSL) and it has the upgrade mechanism (using the --http2 flag). Using that flag I saw that the website doesn't support clear HTTP/2. (There is an option to connect directly with HTTP/2 in clear, without the upgrade mechanism, using --http2-prior-knowledge , but it doesn't work either).