server offered unsupported auth scheme: Negotiate

[sanderhollaar]

Running Cyrus JMAP 3.12.0 I get:

[nix-shell:/tmp/mujmap]$ ./target/debug/mujmap -C ~/Maildir/sander/ sync
error: Could not sync mail: Could not open remote session: Could not open session at https://jmap.<domain>/.well-known/jmap: https://jmap.<domain>/jmap: status code 401

[nix-shell:/tmp/mujmap]$ ./target/debug/mujmap -vv -C ~/Maildir/sander/ sync 2>&1 | grep offered
[2025-05-25T18:50:29Z DEBUG mujmap::remote] server offered unsupported auth scheme: Negotiate

Caddy:

  "resp_headers": {
[..]
    "Www-Authenticate": [
      "Negotiate",
      "SCRAM-SHA-256 realm=\"otter\"",
      "SCRAM-SHA-1 realm=\"otter\"",
      "Basic realm=\"otter\""
    ],
[..]
  }

If I patch src/remote.rs with:

diff --git a/src/remote.rs b/src/remote.rs
index 7829255..3d7c88d 100644
--- a/src/remote.rs
+++ b/src/remote.rs
@@ -285,6 +285,11 @@ impl Remote {
                         Some(encode_basic(username, password))
                     }

+                    Some(v) if v.starts_with("Negotiate") => {
+                        debug!("server offered Negotiate auth");
+                        Some(encode_basic(username, password))
+                    }
+
                     Some(v) if v.starts_with("Bearer") => {
                         debug!("server offered Bearer auth");
                         Some(format!("Bearer {}", password))

I get:

$ mujmap -C ~/Maildir/sander/ sync
Retrieving metadata... (0 possibly changed)
Applying changes to notmuch database... (0 new, 0 changed, 0 destroyed)
Applying changes to JMAP server... (0 changed)

$ mujmap -vv -C ~/Maildir/sander/ sync 2>&1 | grep offered
[2025-05-25T18:52:23Z DEBUG mujmap::remote] server offered Negotiate auth