From b01984addb075f411b24d4c427ac42cc44ebbe8f Mon Sep 17 00:00:00 2001
From: Thomas Eizinger <thomas@eizinger.io>
Date: Mon, 30 Jun 2025 17:20:55 +0200
Subject: [PATCH] fix(phoenix-channel): replace all non-ASCII chars in user
 agent (#9725)

HTTP headers only reliably support ASCII characters. We include
information like the user's kernel build name in there and therefore
need to strip non-ASCII characters from that to avoid encoding errors.

Fixes: #9706
---
 rust/connlib/phoenix-channel/src/lib.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rust/connlib/phoenix-channel/src/lib.rs b/rust/connlib/phoenix-channel/src/lib.rs
index e04a7b6dc..89851ce37 100644
--- a/rust/connlib/phoenix-channel/src/lib.rs
+++ b/rust/connlib/phoenix-channel/src/lib.rs
@@ -825,6 +825,8 @@ fn make_request(url: Url, host: String, user_agent: String) -> Request {
     OsRng.fill_bytes(&mut r);
     let key = base64::engine::general_purpose::STANDARD.encode(r);
 
+    let user_agent = user_agent.replace(|c: char| !c.is_ascii(), "");
+
     Request::builder()
         .method("GET")
         .header("Host", host)