| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide techniques for sustaining session connections. <P>SOLUTION: The techniques send heartbeat messages when not sending a message may cause the session connection to close because of a timeout condition. Heartbeat messages are valid transport layer messages that will be ignored by protocols at higher levels of a data communication stack. As an example, the techniques may send a TCP message containing only a carriage return and line feed ("CRLF") in its payload. Because the TCP layer considers a message containing only a CRLF to be a valid TCP message, intermediary computing devices such as proxy servers may not interpret heartbeat messages as "keep alive" messages, and may sustain session connections. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
