Browsing http://localhost:5000 causes binary file to be downloaded

[tony19]

Description

After starting simplehttp2server, the console shows Listening on :5000.... If we forget that it's serving over https and try to access http://localhost:5000, a binary file gets downloaded.

Steps to Reproduce

1. CD into directory containing index.html
2. Run simplehttp2server.
3. Browse to http://localhost:5000 (instead of https).

Expected Results

• Server log shows full URL (i.e., Listening on https://localhost:5000)
• or any of the following:
  • Redirect to https (301)
  • Serve the index.html (unencrypted h2 preferably, or even http/1.1)
  • Display a meaningful/helpful error page
  • Display a meaningful/helpful error on the terminal's server log

Actual Results

• Binary file is downloaded instead of a page shown in browser
• Server log emits cryptic (at least for someone unfamiliar with TLS) error:

2016/06/17 22:12:43 http: TLS handshake error from [::1]:54431: tls: first record does not look like a TLS handshake

Environment

x	Version
Operating System	OS X El Capitan
Go	go version go1.6.2 darwin/amd64
Shell	zsh
Browser	Chrome 51

[surma]

Yes, I have not quite figured out what to do abut that. The reason this is happening is that the browser tries to connect with TLS on a non-TLS port. I don’t want to add support for unencrypted http/1.1 because this is not a production server anyways and it should be obvious right away if you are not successfully using h2. A custom error page would be a good idea, but I don’t think I can serve both HTTP and HTTP/2 on the same port. I’ll investigate.

Server log shows full URL
That is a good remark. Will add.