2 iRules - HTTP rewrites keeping info from rule to rule

I believe your first iRule will do what you wish, but it looks like you are trying to add the serverxx as a query. If this is the case, you will need to insert a "?" like the following

 

HTTP::redirect "mysite.com/nextserver/$uri\?$serverxx"

 

Then, your 2nd iRule should work. However, if the original URI already contains a query (i.e a "?" followed by other text), then this will not work. If you could insert the $serverxx as a query parameter, is serverxx=$serverxx, you could just check for that in the 2nd iRule and it would always work. One would have to search in the first iRule to insert the query parameter differently if the original URI already contains query parameters. ?serverxx=$serverxx if there is no query parameter and ,serverxx=$serverxx if there is already a query parameter(s).