fix(discov): move etcd hosts from URI authority to path for Go 1.26 compatibility (#5548)

zrpc/resolver/internal/targets/endpoints.go

@@ -17,3 +17,29 @@ func GetAuthority(target resolver.Target) string {
 func GetEndpoints(target resolver.Target) string {
 	return strings.Trim(target.URL.Path, slashSeparator)
 }
+
+// GetHosts returns the comma-separated etcd hosts from the target URL.
+// It supports two formats:
+//   - New format (etcd:///h1:port,h2:port?key=k): hosts are in the URL path (empty authority)
+//   - Legacy format (etcd://h1:port/key): host is in the URL authority
+func GetHosts(target resolver.Target) string {
+	if target.URL.Host == "" {
+		// New format: hosts encoded in URL path to avoid RFC 3986 authority issues
+		return GetEndpoints(target)
+	}
+	// Legacy format: single host in authority
+	return target.URL.Host
+}
+
+// GetKey returns the etcd key from the target URL.
+// It supports two formats:
+//   - New format (etcd:///h1:port,h2:port?key=k): key is in the "key" query parameter
+//   - Legacy format (etcd://h1:port/key): key is in the URL path
+func GetKey(target resolver.Target) string {
+	if target.URL.Host == "" {
+		// New format: key is in the query parameter
+		return target.URL.Query().Get("key")
+	}
+	// Legacy format: key is in the path
+	return strings.Trim(target.URL.Path, slashSeparator)
+}