1 files changed, 11 insertions, 0 deletions
diff --git a/lib/bundler/fetcher/downloader.rb b/lib/bundler/fetcher/downloader.rb
index c8d714c05a..ee1aa1a972 100644
--- a/lib/bundler/fetcher/downloader.rb
+++ b/lib/bundler/fetcher/downloader.rb
@@ -38,6 +38,8 @@ module Bundler
       end
 
       def request(uri, options)
+        validate_uri_scheme!(uri)
+
         Bundler.ui.debug "HTTP GET #{uri}"
         req = Net::HTTP::Get.new uri.request_uri, options
         if uri.user
@@ -61,6 +63,15 @@ module Bundler
           raise HTTPError, "Network error while fetching #{URICredentialsFilter.credential_filtered_uri(uri)}"
         end
       end
+
+    private
+
+      def validate_uri_scheme!(uri)
+        return if uri.scheme =~ /\Ahttps?\z/
+        raise InvalidOption,
+          "The request uri `#{uri}` has an invalid scheme (`#{uri.scheme}`). " \
+          "Did you mean `http` or `https`?"
+      end
     end
   end
 end