Method to retrieve port after starting with port 0? about cpp-httplib HOT 5 CLOSED

@sgraham, thanks for the feedback. cpp-httplib doesn't have a method that tells the actual port.

It seems like we can figure out the actual port with getsockname system call. But it's a bit difficult to pass the result to a user, since Server::listen method is a blocking method.

We are able to make a method like Server::get_actuall_port. But a use can call the method only on a different thread.

Another way is that we could make a method like Server::on_connected which takes a callback function where we will receive the actual port number.

I'll get back to you when I decide which solution should be taken.

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Thank you for considering this request! Perhaps an on_connected() would be slightly simpler conceptually, but either of those solutions seem fine to me.

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Another thought I just had... I think the port is selected by this point? https://github.com/yhirose/cpp-httplib/blob/master/httplib.h#L1413

Perhaps it would be possible to split optionally split listen() at that location, so that the user can call something like bind_to_any(), which could return the selected port, and then call listen_after_bind(). I'm not sure if that's better or worse than an optional callback though.

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Something like https://github.com/yhirose/cpp-httplib/compare/master...sgraham:system-assigned-port?expand=1 is what I was thinking for above, if you like that approach.

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@sgraham, your approach looks much better than mine! Could you make a pull request, so that I could merge it to my master. The only thing is the name of bind_to_any(). Could something like bind_to_any_port() be clearer to users?

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