CheckUpDown

 

Errors reported by CheckUpDown

Introduction to errors

任何客户端 ( 例如您的浏览器或我们的 CheckUpDown 机器人 ) 在和您的网络服务器通讯时,都需经过以下循环:

  1. 从您站点的 IP 名称 ( 即您的网页地址 - URL, 不带起始的 ‘http://') 获得一个 IP 地址。这个对应关系 ( 即由 IP 名称向 IP 地址转换的对应关系 ) 由域名服务器 (DNSs) 提供。
  2. 打开一个 IP socket ( 套接字 ) 连接到该 IP 地址。
  3. 通过该 socket 写 HTTP 数据流。
  4. 从您的网络服务器接受响应的 HTTP 数据流。该数据流包括状态编码, 其值取决于 HTTP 协议 。 解析 该数据流得到 状态编码 和其他有用信息。

An error may occur in any of the above steps. Our CheckUpdown robot isolates any error and reports it as an error code for your account (as a clickable link) along with details of when the error was detected.

The error codes the client may receive are given below - follow the URL for each to see further discussion of the error and what further action we recommend.

0?? errors

Errors with a code in the range 001-099 indicate a fundamental failure to communicate, typically in the early steps above. Note these errors are not defined in the HTTP protocol - they are specific to our CheckUpDown service.

001 - Unknown Host
002 - I/O Exception
003 - Undefined HTTP Status Code
004 - Bad URL
005 - Host not reachable
006 - No connection
007 - I/O Interrupt
008 - Socket failure
009 - SSL secure socket failure
010 - Check word not found
011 - Socket Timeout

3?? errors

Errors with a code in the range 300-399 indicate a redirection of the Web site URL. As of September 2000, CheckUpDown follows some URL redirections (301, 302, 303, 307) automatically, so these should no longer be reported as an error.

300 - Multiple Choices
301 - Moved permanently
302 - Moved temporarily
303 - See other
304 - Not modified
305 - Use proxy
307 - Temporary Redirect

4?? errors

Errors with a code in the range 400-499 occur where the Web server - incorrectly or not - dislikes the HTTP data streams that the client sends to it. Quite rare.

400 - 请求无效 (Bad request)
401 - 未授权 (Unauthorized)
403 - 禁止访问 (Forbidden)
404 - 未找到 (Not found)
405 - 方法不被允许 (Method not allowed)
406 - 无法接受 (Not acceptable)
407 - 要求代理身份验证 (Proxy authentication required)
408 - 请求超时 (Request timeout)
409 - 冲突 (Conflict)
410 - 已消失 (Gone)
411 - 需要内容长度头 (Length required)
412 - 先决条件失败 (Precondition failed)
413 - 请求实体太大 (Request entity too large)
414 - 请求 URI 过长 (Request URI too long)
415 - 不 支持的媒体类型(Unsupported media type)
416 - 所请求的范围无法满足 (Requested Range not satisfiable)
417 - 预期结果失败 (Expectation failed)

5?? errors

Errors with a code in the range 500-599 occur where the Web server reports an internal error in its operations.

500 - 内部服务器错误 (Internal server error)
501 - 未实现 (Not implemented)
502 - 网关错误 (Bad gateway)
503 - 服务不可用 (Service unavailable)
504 - 网关超时 (Gateway timeout)
505 - HTTP 版本不受支持 (HTTP version not supported)