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Java Servlet Programming by Jason Hunter

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Appendix C. HTTP Status Codes

HTTP status codes are grouped as shown in Table 3.1.

Table C-1. HTTP Status Code Groupings

Code Range

Response Meaning

100-199

Informational

200-299

Client request successful

300-399

Client request redirected, further action necessary

400-499

Client request incomplete

500-599

Server error

Table 3.2 lists the HTTP status code constants defined by the HttpServletResponse interface and used as parameters to its setStatus() and sendError() methods. The version number in the last column refers to the HTTP protocol version that first defined the status code. The Servlet API 2.0 added constants for HTTP Version 1.1 status codes. Note that HTTP 1.1 status codes require an HTTP 1.1-compliant browser.

For more information on HTTP, see Web Client Programming by Clinton Wong (O’Reilly). The proposed HTTP/1.1 specification is available in RFC 2068 at http://www.ietf.org/rfc/rfc2068.txt.

Table C-2. HTTP Status Code Constants

Constant

Code

Default Message

Meaning

HTTP Version

SC_CONTINUE

100

Continue

The server has received the initial part of the request, and the client can continue with the remainder of its request.

1.1

SC_SWITCHING_PROTOCOLS

101

Switching Protocols

The server is willing to comply with the client’s request to switch protocols to the one specified in the request’s Upgrade header. This might include switching to a newer HTTP version.

1.1

SC_OK

200

OK

The client’s request was successful and the server’s response ...

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