Web Caching

Appendix F. HTTP Status Codes

This list of HTTP status codes is meant to be a quick, albeit incomplete, reference. Many of these codes are not mentioned elsewhere in this book. However, you may encounter them when examining log files or debugging HTTP problems. Refer to Section 10 of RFC 2616 for complete and official definitions.

1xx Intermediate Status

100 Continue

This code informs the client that it should proceed with its request. This is useful when the client is sending a large message body. After sending the headers, the client waits for the 100 response and then sends the message body.

101 Switching Protocols

This code allows clients and servers to negotiate the use of an alternate transfer protocol or a different version of HTTP.