Access-Control-Allow-Headers

HTTP response header

The Access-Control-Allow-Headers response header is used in response to a preflight request which includes the Access-Control-Request-Headers to indicate which HTTP headers can be used during the actual request. This header is required if the request has an Access-Control-Request-Headers header

Header usage statistics

Access-Control-Allow-Headers response header information and usage statistics.

Websites using header Access-Control-Allow-Headers668,372
Percentage of websites that use Access-Control-Allow-Headers header0.70%
Total discovered header valuesMore than 10,000
Header uses directivesYes
Header values are unique or randomNo
Most popular in the country US

Access-Control-Allow-Headers directives (18 total)

  • *
  • accept
  • access_token
  • authorization
  • cache-control
  • client-security-token
  • content-type
  • dnt
  • if-modified-since
  • keep-alive
  • origin
  • soapaction
  • typeform-version
  • user-agent
  • x-accept-charset
  • x-customheader
  • x-requested-with
  • x-typeform-key

Access-Control-Allow-Headers Directives

Access-Control-Allow-Headers directives value information and usage statistics

DirectiveShareWebsites countUnique Values
content-type78.01%521,3972
x-requested-with56.11%374,9942
origin32.62%218,0391
accept32.19%215,1811
authorization29.99%200,4571
cache-control22.20%148,4011
if-modified-since16.80%112,2811
user-agent15.47%103,4081
dnt14.02%93,6991
*12.82%85,6561
keep-alive11.72%78,3331
x-customheader8.31%55,5751
client-security-token2.37%15,8261
soapaction1.40%9,3451
x-accept-charset0.97%6,4841
typeform-version0.30%2,0271
x-typeform-key0.30%2,0271
access_token<0.1%4091

Connected technologies

Technologies that utilize the header

Ckan, category Content Management System, total 599 websites
Tealeaf, category Analytics, total 185 websites

Distribution by websites popularity

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

Top 10k sites379 websites
Top 100k sites2,768 websites
Top 1m sites20,233 websites

Websites utilizing Access-Control-Allow-Headers

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

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Geographical Distribution

Header usage distribution by websites across the globe.






Common header values

List of top common Access-Control-Allow-Headers header values

Header valueValue prevalence
*12.11%
origin, x-requested-with, content-type9.73%
content-type8.13%
accept, content-type, cache-control, gclid5.15%
DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization5.15%
Origin, X-Requested-With, Content-Type, Accept4.70%
x-requested-with,content-type3.10%
X-Requested-With2.57%
DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range1.87%
accept, x-request, x-requested-with1.55%
Content-Type, Authorization1.43%
Origin, X-Requested-With, Content-Type, Accept, Authorization1.37%
x-requested-with, Content-Type, origin, authorization, accept, client-security-token1.37%
Content-Type,Accept1.24%
Content-Type, soapaction1.24%
DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type1.18%
Content-Type, Authorization, X-Requested-With0.99%
Authorization, Content-Type, If-Match, If-Modified-Since, If-None-Match, If-Unmodified-Since, X-Requested-With0.86%
Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Requested-With0.84%
X-Accept-Charset,X-Accept,Content-Type0.80%