Question: Is it possible to avoid binding a UDP socket?

[kjvalencik]

isahc/src/agent.rs

Line 76 in 5b17d4c

let wake_socket = UdpSocket::bind("127.0.0.1:0")?;

It might be outside the scope of this project, but I'm attempting to use isahc in a macOS app with sandboxing enabled. Since isahc creates a UDP socket, it requires the server entitlement even when I only need to make client requests.

It would be nice if this could be achieved without a socket or if concurrency was feature flagged.

[sagebind]

Thanks for filing an issue! I'm always happy to accept feedback such as this. The use of UDP is unfortunate here, as it is the only good cross-platform way to interrupt a select(2) call which is how Isahc does its I/O asynchronously. We could use a UNIX pipe instead of UDP on Linux and macOS without too much trouble though.

That said, I'm already working on getting rid of the UDP socket completely in #243, by replacing select(2) altogether with a different I/O driver that supports wakeups natively. I'm not sure what the timeline on that PR is though since finicky IOCP bits on Windows has been causing some trouble so far, though hopefully it will be ready by the end of the year.

[kjvalencik]

@sagebind That's awesome! isahc is fantastic and I would love to be able to use it in my cross platform app. Unfortunately, requiring the server entitlement on Apple isn't an option because it would be denied by the app store. Let me know if there's anything I can do to help. 😁 Cheers!

[sagebind]

This is now fixed in the 1.2.0 release! Sorry about the delay, as this required a significant refactoring. Better late than never I suppose?

[kjvalencik]

Awesome! Thanks so much @sagebind!