diff --git a/src/main/java/com/googlesource/gerrit/plugins/download/scheme/AnonymousHttpScheme.java b/src/main/java/com/googlesource/gerrit/plugins/download/scheme/AnonymousHttpScheme.java
index 905b0b6..1ea2cf0 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/download/scheme/AnonymousHttpScheme.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/download/scheme/AnonymousHttpScheme.java
@@ -71,6 +71,11 @@
     return false;
   }
 
+  @Override
+  public boolean isAuthSupported() {
+    return false;
+  }
+
   private static String ensureSlash(String in) {
     if (in != null && !in.endsWith("/")) {
       return in + "/";
diff --git a/src/main/java/com/googlesource/gerrit/plugins/download/scheme/GitScheme.java b/src/main/java/com/googlesource/gerrit/plugins/download/scheme/GitScheme.java
index 77b12b0..e185fdc 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/download/scheme/GitScheme.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/download/scheme/GitScheme.java
@@ -56,6 +56,11 @@
     return false;
   }
 
+  @Override
+  public boolean isAuthSupported() {
+    return false;
+  }
+
   private static String ensureSlash(String in) {
     if (in != null && !in.endsWith("/")) {
       return in + "/";
diff --git a/src/main/java/com/googlesource/gerrit/plugins/download/scheme/HttpScheme.java b/src/main/java/com/googlesource/gerrit/plugins/download/scheme/HttpScheme.java
index b97a1bd..af75046 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/download/scheme/HttpScheme.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/download/scheme/HttpScheme.java
@@ -86,6 +86,11 @@
     return true;
   }
 
+  @Override
+  public boolean isAuthSupported() {
+    return true;
+  }
+
   private static String ensureSlash(String in) {
     if (in != null && !in.endsWith("/")) {
       return in + "/";
diff --git a/src/main/java/com/googlesource/gerrit/plugins/download/scheme/SshScheme.java b/src/main/java/com/googlesource/gerrit/plugins/download/scheme/SshScheme.java
index f662060..8253b66 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/download/scheme/SshScheme.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/download/scheme/SshScheme.java
@@ -79,6 +79,11 @@
     return true;
   }
 
+  @Override
+  public boolean isAuthSupported() {
+    return true;
+  }
+
   private static String ensureSlash(String in) {
     if (in != null && !in.endsWith("/")) {
       return in + "/";