May 2017
Intermediate to advanced
156 pages
3h 22m
English
Content preview from Learning HTTP/2
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Chapter 4. Transition to HTTP/2
To be flip and mildly unhelpful, one could say that in order to support HTTP/2 all you need to do is upgrade to a web server that speaks h2, or use a Content Delivery Network (CDN) that will front your website and speak it for you. Though true, it is glossing over a host of subtleties that may not be obvious and could result in unexpected higher costs or suboptimal performance. Here are a handful of the items you should consider before turning HTTP/2 on for your website:
-
Browser support for h2
-
Potential move to serving over TLS (HTTPS)
-
Tuning your website for h2 (possibly untuning for h1)
-
Third parties on your site
-
Retaining support for old clients
This chapter explains what you need to know about each of these topics.
Browser Support
As of publishing time, around 80% of web browsers in use support h2 to some degree.1 This means a significant portion of people will start reaping the benefits of h2 as soon as it is turned on. Since the protocol negotiation is transparent to non-h2 supporting browsers, anyone who does not speak h2 will simply fall back to h1 and still access your infrastructure. (You did keep h1 support for now, right?)
Table 4-1 lists browsers and the latest version supporting HTTP/2.
| Name | Since version | Notes |
|---|---|---|
Chrome |
41 |
|
Firefox |
36 |
|
Edge |
12 |
|
Safari |
9 |
OSX 10.11 and later |
Internet Explorer |
11 |
Windows 10 only |
Opera |
28 |
|
Safari - iOS |
9.2 |
|
Android Browser |
51 |
|
Chrome - ... |
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