sockjs/sockjs-ruby — comment on commit acf3e8bc4753923d8dafa2acdd7c8119e1c9d68c
File:  line 0
By majek:

Unfortunately HTTP/1.0 is still being used used. Squid proxy (quite popular proxy at a time) didn't support HTTP/1.1 up to version 3.1: http://wiki.squid-cache.org/Features/HTTP11 ([another source](http://serverfault.com/questions/58803/how-to-configure-squid-to-send-back-a-http-1-1-response-for-a-http-1-1-request)). It's your choice to rule out http/1.0 if you wish.