Unix Domain Sockets Guide

HTTPX does not provide Unix domain socket (AF_UNIX) listeners or dialing. Server binds TCP (host/port, with .port = 0 for an ephemeral port) and the client dials TCP. For same-machine IPC, bind to loopback instead:

var server = try httpx.Server.init(allocator, io, .{
    .host = "127.0.0.1",
    .port = 0,
});
defer server.deinit();
const port = server.localPort();

See TCP Local for a loopback round trip and Simple Server for the standard lifecycle.