Need help with Irule to redirect based on http path or host header

Try this, just a quick iRule thrown together

when HTTP_REQUEST {
    if { [string tolower [HTTP::path]] starts_with "/socket.io" } {
       pool poolA
       } elseif { { [HTTP::header "Upgrade"] contains "Upgrade" } && { [string tolower [HTTP::host]] starts_with "ws" } } {
       pool poolb
       }
}

Just be careful, the first condition for your elseif will be :

elseif { { [HTTP::header "Upgrade"] contains "WebSocket" } && { [string tolower [HTTP::host]] starts_with "ws" } } {

The mistake was just on "Upgrade" instead of "WebSocket"

Just be careful, the first condition for your elseif will be :

elseif { { [HTTP::header "Upgrade"] contains "WebSocket" } && { [string tolower [HTTP::host]] starts_with "ws" } } {

The mistake was just on "Upgrade" instead of "WebSocket"

So next question if none of those conditions match will the default pool be chosen or do I have to put else default at the end of the rule?

Yes you're right, if none of this conditions match your default pool will be chosen.

Here is the irule I have, let me know if it looks correct.

Assign a pool HTTP path matches
 when HTTP_REQUEST {
 if {
 { [string tolower [HTTP::path]] starts_with "/socket.io" } {
    pool pl_vantage-beta_1337
Or if header string matches    
} elseif { { [HTTP::header "Upgrade"] contains "WebSocket" } && { [string tolower  [HTTP::host]] starts_with "ws" }} {
    pool pl_vantage-beta_1337 }
Otherwise use default pool
    default {
        pool pl_vantage-beta_http
    }
} 

Your last condition is not good. Default is only used when you use the "switch" parser instead of multiples if, elseif...

So you can replace default by else and it will work.

Remember that you don't need to use your last line with the else, because on your virtual server you can set a default pool.

Awesome, thanks for the help guys I am going to test this out today.

Here is the final irlule, when I add it to the virtual everything breaks. If you guys could take a look I would appreciate it. Thanks

 Assign a pool HTTP path matches
 when HTTP_REQUEST {
 if { [string tolower [HTTP::path]] starts_with "/socket.io" } {
    pool pl_vantage-beta_1337
Or if header string matches    
} elseif { { [HTTP::header "Upgrade"] contains "WebSocket" } && { [string tolower  [HTTP::host]] starts_with "ws" }} {
    pool pl_vantage-beta_1337 }
Otherwise use default pool
    }

Everything breaks ?!