HTTP/2 and SPDY indicator

An indicator button for HTTP/2, SPDY and QUIC support by each website.

What is HTTP/2 and SPDY indicator?

HTTP/2 and SPDY Indicator is a Chrome extension that displays a lightning icon in the address bar indicating whether a website supports HTTP/2, SPDY, or neither.

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Stats

This extension was removed from Chrome Web Store on 2022-05-27

By: rauchg

Users: 70,000+

Rating: 4.69 (204)

Version: 1.0.0 (Last updated: 2016-03-11)

Creation date: 2016-03-11

Risk impact: Moderate risk impact

Risk likelihood: High risk likelihood

Manifest version: 2

Permissions:

tabs

Size: 44.62K

Stats date:

Other platforms

Not available on Firefox

Not available on Edge

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Summary

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HTTP/2 (based on Google's SPDY) makes the information exchange between browser and server significantly more performant. Websites and applications that upgrade their infrastructure to support them are at a clear advantage.

This extension shows a lightning icon in the address bar that's blue if the page is HTTP/2 enabled, green if the page is SPDY enabled, and gray if neither is available.

Currently it leverages the browser API for determining this, which relies on the protocol used for the initial page request.

NEW in 1.0.0: support for latest Chrome, performance improvements, better icons! NEW in 0.7.1: title and description improvements" NEW in 0.7.0: added SPDY/5a1 support" NEW in 0.6.0: added HTTP/2 icon [MATSUU Takuto]" NEW in 0.5.0: added SPDY3.1 icon [MATSUU Takuto]" NEW in 0.4.0: fix SPDY2 icon and added QUIC! [MATSUU Takuto]" NEW in 0.3.0: version numbers for SPDY 2 and 3 in the icon [MATSUU Takuto] NEW in 0.2.0: option to disable gray icon when SPDY is not enabled

User reviews

Great. But how about showing HTTP/3 now that Chrome supports it?

Brian Gregory, 2019-11-07

gives deprecation warning in recent chrome versions because it's using loadTimes. Nice ext though.

Jakob Hirsch, 2019-03-21

why i cannot see the red color, even when i open google and youtube? I have enable QUIC in my chrome. it always shows the blue color with http2 enabled. but i didn't find quic session

by yu liu, 2018-10-31

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Safety

Risk impact

HTTP/2 and SPDY indicator may not be safe to use and it requires some risky permissions. Exercise caution when installing this extension. Review carefully before installing.