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Requests sent with an If-Modified-Since header always return a 304 Not Modified response
When the Last Modified header is not present in the response, its default value i.e., Thu, 01 Jan 1970 00:00:00 GMT, is used and 304 Not Modified is sent to the client.
The Last Modified header is not included in the origin server response headers.
Add the Last-Modified header to the response headers using iRule when HTTP_RESPONSE priority 1 { set time [clock format [clock seconds] -gmt 1 -format "%a, %d %b %Y %H:%M:%S %Z"] HTTP::header insert Last-Modified $time log local0.debug "Inserting Last-Modified header as $time" }
Use date header value when Last-Modified is not present in Response headers
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