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 1,153,486
Percentage of websites that use Access-Control-Allow-Origin header 2.15%
Total discovered header values 57,896
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
* 31.43% 362,517 1
null <0.1% 223 1

Connected technologies

Technologies that utilize the header

Loadmill, category Dev Tools, total 21 websites

Distribution by websites popularity

Access-Control-Allow-Origin detection in the top websites by popularity

Top 10k sites 1,049 websites
Top 100k sites 5,377 websites
Top 1m sites 40,233 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 2 United States of America 22 United States of America 39 United States of America 41 United States of America 47 United States of America 48
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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
* 88.66% 1.25% 0.38% 0.32% 0.24%
* 0.15% 0.11% 0.09% 0.09%, 0.09% 0.09% 0.08% 0.08% 0.06%
http://localhost:3000 0.05%
* 0.05%
undefined 0.05% 0.04%
null 0.04% 0.04%