I was able to repro building httpd from 2.4.x branch and following your configuration files on github. I am almost sure that somewhere httpd sets the Last-Modified header translating "foo" to the first Jan 1970 date. I realized though that I didn't recall the real issue, since passing value not following the RFC can lead to inconsistencies, so I went back and checked the correspondence. Quoting:"Actually I wrote this snippet to highlight the behaviour (the original code sent the date in iso8601 instead of rfc1123) because it was more obvious.During my tests (this is extracted from an automated test suite), even after having converted dates to rfc1123, I continued to get some sparse errors. What I got is that the value I sent was sometimes slightly modified (a second or 2) depending on the machine load."So my understanding is that you would like to know why a Last-Modified header with a legitimate date/time set by a PHP app gets "delayed" by a couple of seconds from httpd, right?
The next step that I want to try is to add more logging in the C files where the Last-Modified header is set via apr_table_setn to narrow down the code responsible for this behavior (please everybody let me know if you have a better/smarter/etc idea :).
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