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-Svc13,049,506
Percentage of websites that use Alt-Svc header21.45%
Total discovered header values826
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
ma99.17%12,941,78227
quic19.75%2,577,21513
h3-q04319.71%2,572,15711
h3-q04619.71%2,572,15711
v18.97%2,476,1407
h3-250.81%105,1402
h3-q0480.75%98,1682
h3-q0490.75%98,1672
persist0.54%70,2852
h2less than 0.1%9,70112
clearless than 0.1%9,2271
h3-24less than 0.1%1,1652

Connected technologies

Technologies that utilize the header
HTTP/3, category Miscellaneous, total 13,038,439 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=8640056%
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"18%
h3=":443"; ma=2592000,h3-29=":443"; ma=259200013%
h3=":8443"; ma=25920003%
h3=":443"; ma=25920002%
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=":50545"; 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=":50944"; ma=25920000%
h3=":50550"; ma=25920000%
h3=":443"; ma=936000%
h3=":443";ma=180;0%
h3=":50559"; ma=25920000%
h3=":50535"; ma=25920000%
h3=":50844"; 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%
h3=":80"; ma=864000%

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