If-Modified-Since

HTTP response header

Header usage statistics

If-Modified-Since response header information and usage statistics.

Websites using header If-Modified-Since 1,794
Percentage of websites that use If-Modified-Since header <0.1%
Total discovered header values 1,360
Header uses directives No
Header values are unique or random No
Most popular in the country United States of America

Distribution by websites popularity

If-Modified-Since detection in the top websites by popularity

Top 10k sites 0 websites
Top 100k sites 6 websites
Top 1m sites 78 websites

Websites utilizing If-Modified-Since

List of websites that use If-Modified-Since header

Domain Country Rank Contacts
help.webex.com United States of America 13,809
www.yachtworld.com United States of America 55,431
i-services.com Canada 63,369
azmvdnow.gov United States of America 89,514
scorepass.com United States of America 92,924
www.scorepass.com United States of America 92,924
See full domain list
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Geographical Distribution

Header usage distribution by websites across the globe.






Common header values

List of top common If-Modified-Since header values

Header value Value prevalence
must-revalidate 3.68%
Fri, 11 Jan 2019 18:43:24 +0100 1.95%
Tue, 22 Jun 2021 08:09:34 +0000 1.45%
off 1.28%
0 1.00%
304 Not Modified 1.00%
Mon, 26 Jul 1997 05:00:00 GMT 0.95%
Wed, 07 Apr 2021 8:38:34 GMT 0.78%
Mon, 22 Jan 2008 00:00:00 GMT 0.72%
Sat, 1 Jan 2005 00:00:00 GMT 0.61%
Sun, 08 Aug 2021 00:00:00 GMT 0.56%
Mon, 02 Aug 2021 08:51:21 +0000 0.50%
2018-01-01 13:00:00 0.50%
Sat, 07 Aug 2021 00:00:00 GMT 0.39%
Mon, 12 Jul 2021 15:50:02 +0000 0.39%
Mon, 1 Apr 2019 00:00:00 GMT 0.39%
Wed, 22 Dic 2018 07:28:00 GMT 0.39%
Tue, 03 Aug 2021 00:00:00 GMT 0.33%
none 0.33%
Fri, 06 Aug 2021 00:00:00 GMT 0.33%