coderef

HTTP/1.1Baseline · Widely available

HTTP/1.1 is a network protocol used by browsers and servers. It has been superseded by HTTP/2 and HTTP/3.

Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Jul 29, 2015. Widely available since Jan 29, 2018.

How to use ↓Compare browsers

Browser support

DesktopChrome
1+Supportedsince Dec 11, 2008
Current: 155
Edge
12+Supportedsince Jul 29, 2015
Current: 154
Firefox
1+Supportedsince Nov 9, 2004
Current: 157
Safari
1+Supportedsince Jun 23, 2003
Current: 27
MobileChrome Android
18+Supportedsince Jun 27, 2012
Current: 155
Firefox Android
4+Supportedsince Mar 29, 2011
Current: 157
Safari iOS
1+Supportedsince Jun 29, 2007
Current: 27

How to use

This feature is Baseline widely available — use it freely, no fallback needed.

Example

Full syntax and examples are on MDN: Accept.

Feature detection

There’s no simple runtime check for this feature; rely on the support table and test in your target browsers.

Documentation (MDN)

Specification

Sub-features

Support for each part of the feature (46). The overall table above shows when the whole feature works.

Sub-featureChromeEdgeFirefoxSafariChrome AndroidFirefox AndroidSafari iOS
http.headers.Accept112111841
http.headers.Accept-Encoding112111841
http.headers.Accept-Language112111841
http.headers.Accept-Ranges112111841
http.headers.Age112111841
http.headers.Cache-Control112111841
http.headers.Connection112111841
http.headers.Content-Disposition112111841
http.headers.Content-Encoding112111841
http.headers.Content-Language112111841
http.headers.Content-Length112111841
http.headers.Content-Location112111841
http.headers.Content-Range112111841
http.headers.Content-Type112111841
http.headers.Date112111841
http.headers.ETag112111841
http.headers.Expires112111841
http.headers.From112111841
http.headers.Host112111841
http.headers.If-Match112111841
Show 26 more
Sub-featureChromeEdgeFirefoxSafariChrome AndroidFirefox AndroidSafari iOS
http.headers.If-Modified-Since112111841
http.headers.If-None-Match112111841
http.headers.If-Range112111841
http.headers.If-Unmodified-Since112111841
http.headers.Keep-Alive112111841
http.headers.Last-Modified112111841
http.headers.Location112111841
http.headers.Origin17970118791
http.headers.Proxy-Authenticate112111841
http.headers.Range112111841
http.headers.Referer112111841
http.headers.Server112111841
http.headers.TE112111841
http.headers.Trailer✕✕✕✕✕✕✕
http.headers.Transfer-Encoding112111841
http.headers.Upgrade512651864.2
http.headers.User-Agent112111841
http.headers.Vary112111841
http.headers.Via112111841
http.methods.CONNECT112111841
http.methods.DELETE112111841
http.methods.GET112111841
http.methods.HEAD112111841
http.methods.OPTIONS112111841
http.methods.POST112111841
http.methods.PUT112111841