XMLHTTP 有个 readyState 属性,还有个 status 属性,status 属性返回当前请求的 HTTP 状态码,因为 XMLHTTP 返回成功了,不一定表示服务器已经正确处理我们的数据了,可能出现了 500服务器内部错误或 404找不到文件的错误等。我们可以在处理时加以判断。
请注意,测试ITPOW的 status 是不成功的,因为我们的服务器配置成任何情况都返回成功值:200。这是我们使用了自定义错误的原因。
附 HTTP 状态码:
长整形标准http状态码,定义如下:
Number | Description |
---|---|
100 |
Continue |
101 |
Switching protocols |
200 |
OK |
201 |
Created |
202 |
Accepted |
203 |
Non-Authoritative Information |
204 |
No Content |
205 |
Reset Content |
206 |
Partial Content |
300 |
Multiple Choices |
301 |
Moved Permanently |
302 |
Found |
303 |
See Other |
304 |
Not Modified |
305 |
Use Proxy |
307 |
Temporary Redirect |
400 |
Bad Request |
401 |
Unauthorized |
402 |
Payment Required |
403 |
Forbidden |
404 |
Not Found |
405 |
Method Not Allowed |
406 |
Not Acceptable |
407 |
Proxy Authentication Required |
408 |
Request Timeout |
409 |
Conflict |
410 |
Gone |
411 |
Length Required |
412 |
Precondition Failed |
413 |
Request Entity Too Large |
414 |
Request-URI Too Long |
415 |
Unsupported Media Type |
416 |
Requested Range Not Suitable |
417 |
Expectation Failed |
500 |
Internal Server Error |
501 |
Not Implemented |
502 |
Bad Gateway |
503 |
Service Unavailable |
504 |
Gateway Timeout |
505 |
HTTP Version Not Supported |
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