Alt-svc HTTP Response Header - Web Tech Survey

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Alt-Svc

HTTP response header

The Alt-Svc header is used to list alternate ways to reach this website

Header usage statistics

Alt-Svc response header information and usage statistics.
Websites using header Alt-Svc13,006,960
Percentage of websites that use Alt-Svc header21.67%
Total discovered header values838
Header uses directivesYes
Header values are unique or randomNo
Most popular in the country United States

Alt-Svc directives (12 total)

  • clear
  • h2
  • h3-24
  • h3-25
  • h3-q043
  • h3-q046
  • h3-q048
  • h3-q049
  • ma
  • persist
  • quic
  • v

Alt-Svc Directives

Alt-Svc directives value information and usage statistics
DirectiveShareWebsites countUnique Values
ma99.05%12,882,98826
quic18.90%2,457,86913
h3-q04318.86%2,452,96011
h3-q04618.86%2,452,95911
v18.00%2,341,6537
h3-250.92%119,0402
h3-q0480.87%113,2032
h3-q0490.87%113,2022
persist0.54%69,7752
h2less than 0.1%12,16211
clearless than 0.1%9,6481
h3-24less than 0.1%8932

Connected technologies

Technologies that utilize the header
HTTP/3, category Miscellaneous, total 12,996,021 websites

Websites utilizing Alt-Svc

List of websites that use Alt-Svc header
DomainCountryRankContacts
fonts.googleapis.com United States1
facebook.com United States2
google.com United States3
wordpress.org United States4
s.w.org United States5
youtube.com United States6
See full domain list

Common header values

List of top common Alt-Svc header values
Header valueValue prevalence
h3=":443"; ma=8640059%
h3=":443"; ma=2592000, h3-29=":443"; ma=2592000, h3-Q050=":443"; ma=2592000, h3-Q046=":443"; ma=2592000, h3-Q043=":443"; ma=2592000, quic=":443"; ma=2592000; v="43,46"17%
h3=":443"; ma=2592000,h3-29=":443"; ma=259200013%
h3=":443"; ma=25920003%
h3=":8443"; ma=25920001%
quic=":443"; h3=":443"; h3-29=":443"; h3-27=":443";h3-25=":443"; h3-T050=":443"; h3-Q050=":443";h3-Q049=":443";h3-Q048=":443"; h3-Q046=":443"; h3-Q043=":443"0%
h3=":443"; ma=2592000, h3-29=":443"; ma=25920000%
h3=":443"; ma=86400; persist=10%
h3=":443"; ma=86400, h3-29=":443"0%
h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=864000%
h3=":50545"; ma=25920000%
h3=":50944"; ma=25920000%
h3=":443"; ma=936000%
h3=":443";ma=180;0%
h3=":50550"; ma=25920000%
h3=":50559"; ma=25920000%
h3=":443"; ma=300, h2=":443"; ma=3000%
h3=":50535"; ma=25920000%
h3=":3443"; ma=2592000, h3-29=":3443"; ma=2592000, h3-Q050=":3443"; ma=2592000, h3-Q046=":3443"; ma=2592000, h3-Q043=":3443"; ma=2592000, quic=":3443"; ma=2592000; v="43,46"0%
clear0%

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