1 files changed, 18 insertions, 6 deletions
diff --git a/lib/rubygems/resolver/activation_request.rb b/lib/rubygems/resolver/activation_request.rb
index 2dd540cda0..135d75d6bc 100644
--- a/lib/rubygems/resolver/activation_request.rb
+++ b/lib/rubygems/resolver/activation_request.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 ##
 # Specifies a Specification object that should be activated.  Also contains a
 # dependency that was used to introduce this activation.
@@ -50,15 +50,27 @@ class Gem::Resolver::ActivationRequest
   # Downloads a gem at +path+ and returns the file path.
 
   def download path
-    if @spec.respond_to? :source
+    Gem.ensure_gem_subdirectories path
+
+    if @spec.respond_to? :sources
+      exception = nil
+      path = @spec.sources.find{ |source|
+        begin
+          source.download full_spec, path
+        rescue exception
+        end
+      }
+      return path      if path
+      raise  exception if exception
+
+    elsif @spec.respond_to? :source
       source = @spec.source
+      source.download full_spec, path
+
     else
       source = Gem.sources.first
+      source.download full_spec, path
     end
-
-    Gem.ensure_gem_subdirectories path
-
-    source.download full_spec, path
   end
 
   ##