Analysis:
HTTP_200: The request has succeeded. The information returned with the response is dependent on the method used in the request。【页面响应正常】
HTTP_302: The requested resource resides temporarily under a different URI. Since the redirection might be altered on occasion, the client SHOULD continue to
use the Request-URI for future requests. This response is only cacheable if indicated by a Cache-Control or Expires header field. 【不正常情况,可能有数据丢失】
HTTP_404: The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent. 【找不到页面,
或者页面未加载完全】
HTTP_500: The server encountered an unexpected condition which prevented it from fulfilling the request.【内部服务器错误】
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