Mention the need for HTTPS

Author: rstub

articles/active-directory/saas-apps/rstudio-connect-tutorial.md

@@ -157,7 +157,7 @@ IdPAttributeProfile = azure
 SSOInitiated = IdPAndSP
 ```
 
-Store your **Server Address** in the `Server.Address` value, and the **App Federation Metadata Url** in the `SAML.IdPMetaData` value.
+Store your **Server Address** in the `Server.Address` value, and the **App Federation Metadata Url** in the `SAML.IdPMetaData` value. Note that this sample configuration uses an unencrypted HTTP connection, while Azure AD requires the use of an encrypted HTTPS connection. You can either use a [reverse proxy](https://docs.rstudio.com/connect/admin/proxy/) in front of RStudio Connect or configure RStudio Connect to [use HTTPS directly](https://docs.rstudio.com/connect/admin/appendix/configuration/#HTTPS). 
 
 If you have trouble with configuration, you can read the [RStudio Connect Admin Guide](https://docs.rstudio.com/connect/admin/authentication/saml/) or email the [RStudio support team](mailto:[email protected]) for help.