ERROR: to help protect your security internet explorer blocked this site from downloading

In my application I will be downloading a csv file. When the run the GWT application in dev mode and copy the url to IE it shows this message. I was told to add the dev mode url to the trusted sites but in the trusted sites it won't accept http portals. How can I change the dev mode URL to https? if else is there anyway i can overcome this issue. And one more thing is my URL won't work on google chrome or firefox. It only works in IE. Is there any reason?

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscribe@googlegroups.com.
To post to this group, send email to google-web-toolkit@googlegroups.com.
Visit this group at http://groups.google.com/group/google-web-toolkit.
For more options, visit https://groups.google.com/groups/opt_out.