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http://issues.apache.org/bugzilla/show_bug.cgi?id=41666

           Summary: If-Unmodified-Since failure
           Product: Tomcat 5
           Version: 5.5.20
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P4
         Component: Catalina
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: [EMAIL PROTECTED]


The If-Unmodified-Since header doesn't work enoughly.

failed case:
 The If-Unmodified-Since header value: 1000000(milliseconds)
 The lastModified value of target resource: 1001000(milliseconds)

In this case, the response's status code should be SC_PRECONDITION_FAILED,
but the result is not so.

caused by:
In DefaultServlet#checkIfUnmodifiedSince:
    if ( lastModified > (headerValue + 1000)) {

I think it should be:
    if ( lastModified >= (headerValue + 1000)) {

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