“invalid dns name” error when fetching IPv6 host over proxy #31504
Description
With an HTTP proxy listening on port 8888:
$ export all_proxy=http://127.0.0.1:8888
$ curl 'https://[2001:4860:4860::64]' # ensure that the proxy works
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>302 Moved</TITLE></HEAD><BODY>
<H1>302 Moved</H1>
The document has moved
<A HREF="https://dns.google/">here</A>.
</BODY></HTML>
$ deno eval 'await fetch("https://[2001:4860:4860::64]", { redirect: "manual" })'
error: Uncaught (in promise) TypeError: error sending request for url (https://[2001:4860:4860::64]/): client error (Connect): invalid dns name
await fetch("https://[2001:4860:4860::64]", { redirect: "manual" })
^
at async mainFetch (ext:deno_fetch/26_fetch.js:192:12)
at async fetch (ext:deno_fetch/26_fetch.js:475:11)
at async …/$deno$eval.mts:1:1
$ deno --version
deno 2.5.6+dd3a7d3 (canary, release, aarch64-apple-darwin)
v8 14.2.231.17-rusty
typescript 5.9.2The same issue happens with a SOCKS5 proxy.