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 2,571,592
Percentage of websites that use Access-Control-Allow-Origin header 2.58%
Total discovered header values 10,001
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
* 86.73% 2,230,219 1
null <0.1% 1,818 1

Connected technologies

Technologies that utilize the header

Loadmill, category Dev Tools, total 30 websites

Distribution by websites popularity

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

Top 10k sites 1,223 websites
Top 100k sites 10,229 websites
Top 1m sites 74,534 websites

Websites utilizing Access-Control-Allow-Origin

List of websites that use Access-Control-Allow-Origin header

Domain Country Rank Contacts Ireland 2 United States of America 14 United States of America 14 United States of America 26 United States of America 31 United States of America 33
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 Access-Control-Allow-Origin header values

Header value Value prevalence
* 86.60% 3.00%
* 0.56% 0.32% 0.27% 0.25% 0.22% 0.14% 0.12% 0.11% 0.10%
undefined 0.08% 0.08%
null 0.07%, 0.06% 0.06% 0.06%
http://localhost:3000 0.05%
none 0.05% 0.05%