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Prefer ipv6 for localhost on macos #837

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Merged
hatoo merged 1 commit into from
Jan 3, 2026
Merged

Prefer ipv6 for localhost on macos #837

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12 changes: 11 additions & 1 deletion src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -542,7 +542,17 @@ pub async fn run(mut opts: Opts) -> anyhow::Result<()> {
let proxy_headers = opts.proxy_headers.into_iter().collect::<HeaderMap<_>>();

let ip_strategy = match (opts.ipv4, opts.ipv6) {
(false, false) => Default::default(),
(false, false) => {
if cfg!(target_os = "macos") && (url.host_str() == Some("localhost")) {
// #784
// On macOS, localhost resolves to ::1 first, So web servers that bind to localhost tend to listen ipv6 only.
// So prefer ipv6 on macos for localhost.

hickory_resolver::config::LookupIpStrategy::Ipv6thenIpv4
} else {
Default::default()
}
}
(true, false) => hickory_resolver::config::LookupIpStrategy::Ipv4Only,
(false, true) => hickory_resolver::config::LookupIpStrategy::Ipv6Only,
(true, true) => hickory_resolver::config::LookupIpStrategy::Ipv4AndIpv6,
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