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Makes the order you wrote the Protocols irrelevant and only the client'sĪ last thing: the protocols you configure are not checked for correctness You want, you can configure your server to select the protocol most preferred by There is one more thing to ordering: the client has its own preferences, too.

Support it, the better order is Protocols h2 h2c http/1.1 Since we want to talk HTTP/2 to clients that The most preferred protocol is HTTP/1 and it will always be selected unless aĬlient only supports h2. When a client offers multiple choices, the one most to the The order of protocols mentioned is also relevant. This is a common mistake that is done while configuring httpd for HTTP/2 the first time, so please keep it in mind to avoid long debugging sessions! If you want to be sure about the cipher suite to choose please avoid the ones listed in the HTTP/2 TLS blacklist. Pointing a browser to a h2 enabled server with a inappropriate cipher suite will force it to simply refuse and fall back to HTTP 1.1. The current version of mod_http2 does not enforce any cipher but most clients do so. The SSLCipherSuite needs to be configured with a strong TLS cipher suite. If OpenSSL is the library you use, you need But not only that, you will need a SSL library URLs, so you need a server with SSL support. Speaking of SSL, you need to be aware that most browsers will speak HTTP/2 only on https: It works quite similar to how one statically links openssl to mod_ssl. For those, the option -enable-nghttp2-staticlib-depsĮxists. While that should do the trick for most, they are people who might prefer a statically Operating system), you may announce its location with ' -with-nghttp2=' Should your libnghttp2 reside in an unusual place (whatever that is on your ' -enable-http2' as additional argument to trigger the build of the module.

configure you Apache httpd source tree, you need to give it In order to build mod_http2 you need at least version 1.2.1 of

HTTP/2 is able to run multiple streams of data over the same TCP connection, avoiding the classic HTTP 1.1 head of blocking slow request and avoiding to re-instantiate TCP connections for each request/response (KeepAlive patched the problem in HTTP 1.1 but did not fully solve it).Īs its implementation base.

More info in the official documentation section. The correspondent concept in HTTP 1.1 is a request/response message exchange.

A stream is a bidirectional flow of frames within the HTTP/2 connection.

A frame is the smallest unit of communication within an HTTP/2 connection, consisting of a header and a variable-length sequence of octets structured according to the frame type.

h2 is HTTP/2 over TLS (protocol negotiation via ALPN).

The latter is meant to be human readable (for example sniffing network traffic) meanwhile the former is not.

HTTP/2 is a binary protocol, as opposed to HTTP 1.1 that is plain text.

Too Long, Didn't read: there are some new terms and gotchas that need to be kept in mind while reading this document:

A muchīetter document to start with is http2 explainedīy Daniel Stenberg, the author of curl. What a thing wants to do and then read the RFC about how it is done. So, there you'll find the nuts and bolts.īut, as RFC do, it's not really a good thing to read first. ( also available in more readable formatting, YMMV). There has been a lot written about HTTP/2 and how it works. You already know HTTP/1, you know 95% about HTTP/2 as well. There are still request and responses and headers and all that. It focuses on making more efficient use of network resources. HTTP/2 is the evolution of the world's most successful application layer protocol, HTTP.