Version compatibility

The Socket.IO protocol has been through a number of revisions, and some of these

introduced backward incompatible changes, which means that the client and the

server must use compatible versions for everything to work.

If you are using the Python client and server, the easiest way to ensure compatibility

is to use the same version of this package for the client and the server. If you are

using this package with a different client or server, then you must ensure the

versions are compatible.

The version compatiblity chart below maps versions of this package to versions

of the JavaScript reference implementation and the versions of the Socket.IO and

Engine.IO protocols.

| JavaScript Socket.IO version | Socket.IO protocol revision | Engine.IO protocol revision | python-socketio version |

| 0.9.x | 1, 2 | 1, 2 | Not supported |

| 1.x and 2.x | 3, 4 | 3 | 4.x |

| 3.x | 5 | 4 | 5.x |