irule to block a non valid url

Hi,

I hope you are you are not getting this request on actual http traffic.You can write an iRule to inspect the first few bytes of the payload and drop anything that's clearly not a valid HTTP request.

Like, Checks if it starts with common HTTP methods (GET, POST, CONNECT, etc.). if its not block it. Sample like 

Try the syntax as well when you write it in any test environment first pls- 

when CLIENT_ACCEPTED {
    TCP::collect 16
}

when CLIENT_DATA {
    # Extract first few bytes
    set first_bytes [TCP::payload 16]

    # If it doesn't start with HTTP methods, it's probably invalid
    if { !([string match -nocase "GET*" $first_bytes] ||
           [string match -nocase "POST*" $first_bytes] ||
           [string match -nocase "HEAD*" $first_bytes] ||
           [string match -nocase "PUT*" $first_bytes] ||
           [string match -nocase "OPTIONS*" $first_bytes] ||
           [string match -nocase "DELETE*" $first_bytes] ||
           [string match -nocase "CONNECT*" $first_bytes]) } {

        log local0. "Blocked invalid HTTP request from [IP::client_addr]:[TCP::client_port] - first bytes: $first_bytes"
        reject
        return
    }

    # Allow valid request
    TCP::release
}