Run html file from google cloud url

Question

I have saved my html file into google cloud storage with public read permission. When I am trying to open html file, Chrome automatically downloads the HTML files locally and does not open it in a browser tab.

Html public url is: https://www.googleapis.com/download/storage/v1/b/presentationpublish/o/index_1112q_252_636703629560463983.html?generation=1534766167109567&alt=media

code:

return storage.UploadObject(
       bucket: BucketName,
       objectName: objectName,
       contentType: "text/html",
       source: valStream,
       options: new UploadObjectOptions { PredefinedAcl = publicRead }
   );