What are anti overload techniques in web server?

 What are anti overload techniques in web server?

At any time web servers can be overloaded because of:

• -          Too much legitimate web traffic
• -          Thousands or even millions of clients hitting the web site in a short interval of time (DDoS) Distributed Denial of Service attacks
• -          Computer worms
• -          Millions of infected browsers and/or web servers
• -          limited on large web sites with very few resources (bandwidth, etc.)
• -          Client requests are served more slowly and the number of connections increases so much that server limits are reached
• -          Web servers required  urgent maintenance or upgrade
• -          Hardware Software failures

To partially overcome load limits and to prevent overload we can use techniques like:

• -          Managing network traffic by using: Firewalls, Block unwanted traffic
• -          HTTP traffic managers- redirect or rewrite requests having bad HTTP patterns
• -          Bandwidth management and traffic shaping
• -          Deploying web cache techniques
• -          Use different domains to serve different content (static and dynamic) by separate Web servers,
• -          Add more hardware resources
• -          Use many web servers

These technique to limit the load on websites are called anti-overload techniques in web server.