Provide the file directly rather than redirecting

lib/api/builds.rb

@@ -69,9 +69,8 @@ module API
         authorize_read_builds!
         build = get_build!(params[:build_id])
-        artifacts_file = build.artifacts_file
-        present_artifact!(artifacts_file)
+        present_artifact!(build.artifacts_file)
       end
       # Download the artifacts file from ref_name and build_name
@@ -90,8 +89,7 @@ module API
         latest_build = builds.success.latest.first
         if latest_build
-          redirect(
-            "/projects/#{user_project.id}/builds/#{latest_build.id}/artifacts")
+          present_artifact!(latest_build.artifacts_file)
         else
           not_found!
         end

spec/requests/api/artifacts_spec.rb

@@ -31,10 +31,15 @@ describe API::API, api: true do
       it_behaves_like 'artifacts from ref with 404'
     end
-    context '302' do
+    context '200' do
       def verify
-        expect(response).to redirect_to(
-          "/projects/#{project.id}/builds/#{build.id}/artifacts")
+        download_headers =
+          { 'Content-Transfer-Encoding' => 'binary',
+            'Content-Disposition' =>
+              "attachment; filename=#{build.artifacts_file.filename}" }
+
+        expect(response).to have_http_status(200)
+        expect(response.headers).to include(download_headers)
       end
       it_behaves_like 'artifacts from ref with 302'