Test: Last-Modified • If-Modified-Since • Not-Modified

This page sends a "Last-Modified: Yesterday/Now" HTTP response header

Last-Modified: Tue, 26 May 2020 16:33:15 GMT

and should respond with 304-Not Modified if you request it (twice) with an "If-Modified-Since: Today/Now" HTTP request header:

If-Modified-Since: Wed, 27 May 2020 16:33:15 GMT

(Please read the tutorial, and here is a tool to test Last-Modified/If-Modified-Since/Not-Modified functionality.)

Here is your HTTP request header:

[GET:] /tools/last-modified-yesterday.php
[Accept:] text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
[Accept-Encoding:] br,gzip
[Accept-Language:] en-US,en;q=0.5
[Connection:] Keep-Alive
[Host:] sebastians-pamphlets.com
[User-Agent:] CCBot/2.0 (https://commoncrawl.org/faq/)

If-modified-since: Thu, 01 Jan 1970 00:00:00 GMT
Last-modified....: Tue, 26 May 2020 16:33:15 GMT