When I tried the RS3 I cannot find this file in [/etc/misc/httpauthexecute.cf] anymore. is this feature removed? or any alternative?
It is bundle version (with built-in tomcat) with modified datasource to MSSQL server, and loaded the DDL sql.
The feature changed somewhat, that is, there is no configuration file necessary any longer. Have a look at https://reportserver.net/en/guides/admin/chapters/Executing-Reports-via-the-URL/#Embedding-Reports-Without-Login for further information.
Regards,
Thomas