[spydum]

The Server: cowboy tag is from an Erlang web server:

https://github.com/ninenines/cowboy/blob/master/src/cowboy_p...

I'm guessing around here would be interesting to add a test case to handle.

As far as whose server this is? I'd guess Heroku or AWS, though it's plenty possible T-Mobile could have devised some proxy to inspect traffic, but seems unlikely they would do so with Cowboy?

[mischanix]

It's simple enough to single out Heroku:

  $ cat <<EOF | nc example.herokuapp.com 80
  GET /test  HTTP/1.1
  
  EOF
  ----
  HTTP/1.1 505 HTTP Version Not Supported

[3ds]

Your example fails with or without the whitespace. These work though:

Request

  printf 'GET / HTTP/1.1\r\nHost: example.herokuapp.com\r\n\r\n' |  nc example.herokuapp.com 80

Response

  HTTP/1.1 200 OK
  Connection: keep-alive
  Server: SimpleHTTP/0.6 Python/2.7.6

Request

  printf 'GET /  HTTP/1.1\r\nHost: example.herokuapp.com\r\n\r\n' |  nc example.herokuapp.com 80

Response

  HTTP/1.1 505 HTTP Version Not Supported
  Connection: close
  Server: Cowboy

[mischanix]

Ah right, forgot about the newline specification. I guess, for reference, the smallest string I can come up with to get Cowboy to spit that error message is '\x20\x20\n'. Parsers are fun.

[davidw]

Heroku use Erlang:

http://www.erlang-in-anger.com/

[lostcolony]

T-mobile is known to have, in the past at least, used Erlang. And Cowboy is one of the most popular web servers within that community at this point.

[jimrhoskins]

Didn't heroku turn off legacy routing last week? I was getting emails warning me to update to their new routing rules by Monday. Seems like it could be related.

[ams6110]

Erlang is from Ericson, a telecom company. T-Mobile is a telecom company. Doesn't seem a stretch that they would use erlang.