Rewrite HTTP Header in FortiADC

I am trying the below scenario in FortiADC

When user request the following website "test1.om" he should get "test2.om".

I tried to make the settings in FortiADC and I am able to do it(when requesting for "test1.om" I am getting "test2.om") but whenever I am opening FortiView - logical topology and clicking on virtual server and then on edit to enable content rewriting and adding the content rewriting rule that I have made and the default redirect rule and saving the changes, the websites which are connected in that virtual server all goes down. which mean if I am requesting "test1.om" it give me "test2.om" but the website is down. If I am disabling the content rewriting rule in virtual server the website "test2.om" works fine.

version of FortiADC : V6.1.0

content Rewriting rule which I created as below
Action Type: Request
Action : Rewrite HTTP Header
Rewrite Host is enabled
Host Content : test2.om

Match condition as below
object : HTTP Host Header
Type: regular expression
Content: test1.om
Reverse: disabled

And the default redirect rule as below
Action Type: Request
Action : Redirect
redirect : https://$0/$1

Match condition there is two as below
1
object : HTTP Host Header
Type: regular expression
Content: (.*)
Reverse: disabled

2
Object : HTTP Host Header
Type: regular expression
Content: ^/(.*)$
Reverse: disabled

I am new in FortiADC and looking for resolution for the above issue when ever enabling the rule in FortiADC all websites which are connected in that virtual server goes down.