Exclude a Specfic url from https re-direction from _sys_https_redirect F5 supplied rule

when HTTP_REQUEST {
if { ([HTTP::host] eq "abc.com") } { 
pool abc.com_pool 
} else { HTTP::redirect https://[HTTP::host][HTTP::uri]  }  
}

iRule will be applied on VS:80

The above logic will send http://abc.com/* to abc.com_pool

Everything else: http:/// will be redirected to the HTTPS version

Is this what you are seeking ? If not, provide the logic that you want to execute via iRule.