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fix(wasm): account for custom DERP ports when checking the probe

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Closes HP-540
This commit is contained in:
Aarnav Tale
2026-06-17 11:30:34 -04:00
parent 8017436bb6
commit c8b1a30f34
2 changed files with 23 additions and 7 deletions
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build.sh
+2 -2
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@@ -138,8 +138,8 @@ build_wasm() {
"$(dirname "$WASM_OUTPUT")/wasm_exec.js"
# Vendor dependencies and apply the DERP port patch.
# Tailscale's derphttp WebSocket URL builder ignores DERPPort,
# which breaks WASM connections to non-443 DERP servers.
# Tailscale's browser WebSocket and netcheck URL builders ignore
# DERPPort, which breaks WASM connections to non-443 DERP servers.
echo "==> Vendoring Go dependencies for WASM patch"
go mod vendor
patches/tailscale-derp-port.patch
+21 -5
View File
@@ -1,9 +1,9 @@
Fix DERP WebSocket URL to include non-standard ports.
Fix DERP browser URLs to include non-standard ports.
Tailscale's derphttp client ignores DERPPort when building WebSocket
URLs, causing connections to fail when DERP servers run on non-443
ports (e.g. :8443). The TCP dial path correctly handles DERPPort
but the WebSocket path (used in WASM/browser builds) does not.
Tailscale's browser DERP paths ignore DERPPort when building WebSocket
and HTTP-only netcheck probe URLs, causing connections to fail when DERP
servers run on non-443 ports (e.g. :8443). The TCP dial path correctly
handles DERPPort but the browser paths used by WASM builds do not.
--- a/derp/derphttp/derphttp_client.go
+++ b/derp/derphttp/derphttp_client.go
@@ -28,3 +28,19 @@ but the WebSocket path (used in WASM/browser builds) does not.
}
// AddressFamilySelector decides whether IPv6 is preferred for
--- a/net/netcheck/netcheck.go
+++ b/net/netcheck/netcheck.go
@@ -1103,7 +1103,11 @@
go func() {
defer wg.Done()
node := rg.Nodes[0]
- req, _ := http.NewRequestWithContext(ctx, "HEAD", "https://"+node.HostName+"/derp/probe", nil)
+ host := node.HostName
+ if node.DERPPort != 0 {
+ host = net.JoinHostPort(node.HostName, fmt.Sprint(node.DERPPort))
+ }
+ req, _ := http.NewRequestWithContext(ctx, "HEAD", "https://"+host+"/derp/probe", nil)
// One warm-up one to get HTTP connection set
// up and get a connection from the browser's
// pool.