Host and URL Rewrite, Content Matching and Redirecting

Below are some example iRules used for redirecting and rewriting URL and Host Headers.

Rewrites

Rewrite Hostname in HTTP Request

when HTTP_REQUEST {
    if { [HTTP::host] equals "domain.com" } {
        HTTP::header replace "Host" "newdomain.com"
    }
}

Rewrite URL in HTTP Request

when HTTP_REQUEST {
    if { [HTTP::uri] starts_with "/sometext" } {
        HTTP::uri "/newtext" 
    }
}

Rewrite Hostname in Response 

when HTTP_RESPONSE {
    if { [HTTP::host] equals "domain.com" } {
        HTTP::header replace "Host" "newdomain.com"
    }
}

Redirects 

Redirect based on URL used

when HTTP_REQUEST {
    if { [HTTP::uri] equals "domain.com" } {
        HTTP::redirect "http://www.newdomain.com/index.htm"
    }
} 

Redirect based on Hostname used

when HTTP_REQUEST {
    if { [HTTP::host] starts_with "/sometext" } {
        HTTP::redirect "http://www.newdomain.com/index.htm"
    }
}