Modify an http header value

I need the big-ip to rewrite the http host statement if a certain http host value is received.

 

 

For example, if the connection to the virtual server is using

 

Host: www1.domain.com

 

I need the big-ip to rewrite it to

 

Host: www2.domain.com

 

 

Unfortunately, the header to erase field in the pool configuration only strips the value from http_host leaving a blank Host: statement in the request to the server. Any attempts to use the header to insert field in the pool settings therefore creates an invalid header with two Host: statements.