DO NOT REPLY [Bug 31896] New: - missing Last-Modified in 304, request to add it

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http://issues.apache.org/bugzilla/show_bug.cgi?id=31896

missing Last-Modified in 304, request to add it

           Summary: missing Last-Modified in 304, request to add it
           Product: Apache httpd-2.0
           Version: 2.0-HEAD
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: Other
         Component: Core
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: Xuefer@21cn.com


[snip]
    if (r->status == HTTP_NOT_MODIFIED) {
        apr_table_do((int (*)(void *, const char *, const char *)) 
form_header_field,
                     (void *) &h, r->headers_out,
                     "Connection",
                     "Keep-Alive",
                     "ETag",
                     "Content-Location",
                     "Expires",
                     "Cache-Control",
                     "Vary",
                     "Warning",
                     "WWW-Authenticate",
                     "Proxy-Authenticate",
                     NULL);
    }                  
    else {
        send_all_header_fields(&h, r);
    }
[/snip]

it's missing "last-modified"
IMHO, ETag is similar as last-modified header, there's no reason to make it 
absent while Etag is there

issue:
it seems that ie will re-request next time if it see "vary" but no last-
modified header.

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