[kevincox]

Note that a lot of these bind to 0.0.0.0 by default. This has caused me surprises in the past as I was failing to connect to a host that is available over IPv6. Sometimes it was even intermittent as I would sometime resolve to the IPv4 and sometimes get the IPv6 and fail.

For python3 this is easily remedied.

    python -m http.server -b ::

On most OS configurations this will listen on both IPv4 and IPv6.

Or for when you only need local access:

    python -m http.server -b localhost

[darkwater]

For the use cases of most of that software list, they should actually listen to localhost (127.0.0.1 and ::1) only, because security. Listening on every IPv6 interface, which might be exposed directly on the IPv6 internet, is even a worse idea.

[kevincox]

In general I agree. Localhost is a safer default, it doesn't cost much to type a bind address when you need jt. However 0.0.0.0 is a worse default than ::