what's mean?why?

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404 - Requested Page Has Moved
On March 1st 2003, the contents of www.ins.usdoj.gov and www.ins.gov were moved to www immigration.gov
An attempt was made to find the specific page you requested:
http://egov.ins.usdoj.gov/grap...ris/jsps/caseStat.jsp

Click on the link below to find the page:
https://egov.immigration.gov/graphics/cris/jsps/caseStat.jsp

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what's mean? why this web can't be opened?why can check k1 or k3 case by this web address?please tell me more. thanks!