HTTP response header

Allows restricted resources on a web page to be requested from another domain outside the domain from which the first resource was served (Indicates whether the response can be shared.)

Header usage statistics

access-control-allow-origin response header information and usage statistics.

Websites using header access-control-allow-origin 503,848
Percentage of websites that use access-control-allow-origin header 4.32%
Total discovered header values 23,164
Header uses directives Yes
Header values are unique or random No
Most popular in the country United States of America

access-control-allow-origin Directives (2 total)

  • *
  • null

access-control-allow-origin Directives

access-control-allow-origin directives value information and usage statistics

Directive Share Websites count Unique Values
* 44.55% 224,460 1
null <0.1% 176 1

Connected technologies

Technologies that utilize the header

Loadmill, category Dev Tools, total 1 websites

Distribution by websites popularity

access-control-allow-origin detection in the top websites by popularity

Top 10k sites 980 websites
Top 100k sites 4,247 websites
Top 1m sites 36,324 websites

Websites utilizing access-control-allow-origin

List of websites that use access-control-allow-origin header

Domain Country Rank Contacts United States of America 22 United States of America 39 United States of America 41 United States of America 48 United States of America 74 United States of America 77
See full domain list

Geographical Distribution

Header usage distribution by websites across the globe.

Common header values

List of top common access-control-allow-origin header values

Header value Value prevalence
* 55.59%
none 37.10% 0.13% 0.08% 0.08% 0.08% 0.07% 0.06%, 0.06% 0.05% 0.05% 0.05%
http://localhost:3000 0.04%
null 0.04% 0.03%
undefined 0.03% 0.03% 0.03% 0.02%
domain 0.02%