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 563,021
Percentage of websites that use access-control-allow-origin header 5.18%
Total discovered header values 23,583
Header uses directives Yes
Header values are unique or random No
Most popular in the country Canada

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
* 49.10% 276,462 1
null <0.1% 161 1

Connected technologies

Technologies that utilize the header

Loadmill, category Dev Tools, total 9 websites

Distribution by websites popularity

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

Top 10k sites 1,077 websites
Top 100k sites 5,482 websites
Top 1m sites 40,893 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 22 United States of America 39 United States of America 41 United States of America 48 United States of America 74
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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
* 60.00%
none 33.16% 0.24% 0.12% 0.10% 0.07% 0.07% 0.07% 0.06%, 0.05% 0.04% 0.04% 0.04%
http://localhost:3000 0.04% 0.03%
null 0.03%
undefined 0.03% 0.03% 0.02%
domain 0.02%