RFC2326(中文版)(16)

RFC2326(中文版)

d
| "453" ; Not Enough Bandwidth
| "454" ; Session Not Found
| "455" ; Method Not Valid in This State
| "456" ; Header Field Not Valid for Resource
| "457" ; Invalid Range
| "458" ; Parameter Is Read-Only
| "459" ; Aggregate operation not allowed
| "460" ; Only aggregate operation allowed
| "461" ; Unsupported transport
| "462" ; Destination unreachable
| "500" ; Internal Server Error
| "501" ; Not Implemented
| "502" ; Bad Gateway
| "503" ; Service Unavailable
| "504" ; Gateway Time-out
| "505" ; RTSP Version not supported
| "551" ; Option not supported
| extension-code
extension-code = 3DIGIT
Reason-Phrase = *<TEXT, excluding CR, LF>

HTTP状态代码是可扩展的，而只有上述代码才可以被当前全部的应用所识别。HTTP
应用不要求了解全部注册的状态代码，当然，如果了解了更好。实际上，应用程序必须理解
任何一种状态代码，如果碰到不识别的情况，可根据其首位数字来判断其类型并处理。另外，
不要缓存无法识别的回应。

例如，如果客户端收到一个无法识别的状态码431，可以安全地假定是请求出了问题，
可认为回应的状态码就是400。在这种情况下，用户代理应当在回应消息的实体中通知用户，
因为实体中可以包括一些人类可以识别的非正常状态的描述信息。

Code reason
100 Continue all
200 OK all
201 Created RECORD
250 Low on Storage Space RECORD
300 Multiple Choices all
301 Moved Permanently all
302 Moved Temporarily all
303 See Other all
305 Use Proxy all
400 Bad Request all
401 Unauthorized all
402 Payment Required all
403 Forbidden all
404 Not Found all
405 Method Not Allowed all
406 Not Acceptable all
407 Proxy Authentication Required all
408 Request Timeout all
410 Gone all
411 Length Required all
412 Precondition Failed DESCRIBE, SETUP
413 Request Entity Too Large all
414 Request-URI Too Long all
415 Unsupported Media Type all
451 Invalid parameter SETUP
452 Illegal Conference Identifier SETUP
453 Not Enough Bandwidth SETUP
454 Session Not Found all
455 Method Not Valid In This State all
456 Header Field Not Valid all
457 Invalid Range PLAY
458 Parameter Is Read-Only SET_PARAMETER
459 Aggregate Operation Not Allowed all
460 Only Aggregate Operation Allowed all
461 Unsupported Transport all
462 Destination Unreachable all
500 Internal Server Error all
501 Not Implemented all
502 Bad Gateway all
503 Service Unavailable all
504 Gateway Timeout all
505 RTSP Version Not Supported all
551 Option not support all
Table 1: Status codes and their usage with RTSP methods

7.1.2 回应标题域
回应标题域中包括不能放在状态行中的附加回应信息。该域还可以存
放与服务器相关的
信息，以及在对请求URI所指定资源进行访问的下一步信息。

response-header = Location ; Section 12.25
| Proxy-Authenticate ; Section 12.26
| Public ; Section 1