The Apache module mod_bwshare throttles HTTP requests to Apache 1 and 2 servers for each client IP address independently.
The mod_bwshare module accepts or rejects HTTP requests from each client IP address based on past downloads by that client IP address.
If the HTTP client's download rate exceeds specified levels, the reponse to the HTTP client is an HTML warning message.
A human browser will see a warning message indicating how long to wait.