If-Modified-Since

HTTP response header

Header usage statistics

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

Websites using header If-Modified-Since 983
Percentage of websites that use If-Modified-Since header <0.1%
Total discovered header values 759
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 3 websites
Top 1m sites 26 websites

Websites utilizing If-Modified-Since

List of websites that use If-Modified-Since header

Domain Country Rank Contacts
tickets.com.tr United States of America 10,390
tickets.ua Germany 98,646
www.dailyo.in United States of America 99,922
www.japansociety.org United States of America 132,323
avia.tickets.ua Germany 162,137
kdp.org United States of America 179,542
See full domain list
Flat price per the report, subscription is not required.

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 4.98%
Fri, 11 Jan 2019 18:43:24 +0100 2.64%
Mon, 03 May 2021 07:11:47 +0000 1.63%
off 1.63%
304 Not Modified 1.22%
Sat, 1 Jan 2005 00:00:00 GMT 0.92%
Sat, 15 May 2021 00:00:00 GMT 0.92%
Tue, 23 Apr 2019 13:54:34 +0000 0.81%
Mon, 22 Jan 2008 00:00:00 GMT 0.71%
Wed, 19 May 2021 07:49:37 +0000 0.71%
Mon, 14 Dec 2020 15:36:49 +0000 0.61%
2018-01-01 13:00:00 0.61%
Sun, 16 May 2021 00:00:00 GMT 0.61%
Mon, 26 Jul 1997 05:00:00 GMT 0.61%
Tue, 18 May 2021 00:00:00 GMT 0.61%
Mon, 17 May 2021 00:00:00 GMT 0.51%
Sat, 01 Jan 2000 00:00:00 GMT 0.51%
0 0.41%
Wed, 19 May 2021 00:00:00 GMT 0.41%
Mon, 1 Apr 2019 00:00:00 GMT 0.41%