== References ==== External links ==* Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing, Connection Management, Persistence* Persistent Connection Behavior of Popular Browsers (dated)* Apache HTTPD Keep-Alive Support* Network Performance Effects of HTTP/1.1, CSS1, and PNG
* RFC 2616 (HTTP/1.1), 8.1 Persistent Connections* Persistent Connection Behavior of Popular Browsers (dated)* Apache Keep-Alive Support* Network Performance Effects of HTTP/1.1, CSS1, and PNG