Add a http header if the request comes from an iphone

[Marcos Filho <marcosfilho88@xxxxxxxxx>]

Hello Guys,

I have the following requirement:

"Add a http header if the request is from an iphone."
ps: this request will be proxied to a apache tomcat server with mod_proxy.

I have checked the mod_headers documentation and it says to use the mod_setenvif 

My apache's version is 2.2.19 and I am trying this configuration:

SetEnvIf %{HTTP_USER_AGENT} value "iphone" [NC]
RequestHeader add deviceType  "HighEnd" 

Also, I tried this:
SetEnvIf User-Agent value "iphone" [NC]
RequestHeader add deviceType  "HighEnd" 

Those "SerEnvIf" are not working and probably I am doing something wrong. 

I have done lots of research on google and then tried lots of settings but nothing is working.

Do you guys have an idea how I can get it working? I would really appreciate your help.

Regards,
Marcos