http2.0的特性

多路复用
头部压缩
服务端推送
新的二进制格式，基本单位为帧，例如HEAD帧，DATA帧
流优先级

nginx编译

./configure --with-http_v2_module --with-debug
make -j 8 && make install

编译安装后查看，可以看到nginx是1.18.0版本，且已支持http2.0

# ./nginx -V
nginx version: nginx/1.18.0
built by gcc 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04) 
configure arguments: --with-http_v2_module --with-debug

nginx配置文件

user  root;
worker_processes  4;

error_log  logs/debug.log  debug;

events {
    worker_connections  1024;
}

http {
    #include       mime.types;
    #default_type  application/octet-stream;
    
    sendfile        on;
    #tcp_nopush     on;
    keepalive_timeout  65;
	
	server {
		client_max_body_size 4G;
		listen       80 http2;  # 此处加上http2就好
		server_name  www.wawa.com;
		root /data;
    
		location ~ /*.mp4$ {
			autoindex on;
			autoindex_exact_size on;
			autoindex_localtime on;
		}
	}
}

使用curl测试

检查curl是否支持http2.0协议

# curl -V
curl 7.58.0 (x86_64-pc-linux-gnu) libcurl/7.58.0 OpenSSL/1.1.1 zlib/1.2.11 libidn2/2.0.4 libpsl/0.19.1 (+libidn2/2.0.4) nghttp2/1.30.0 librtmp/2.3
Release-Date: 2018-01-24
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtmp rtsp smb smbs smtp smtps telnet tftp 
Features: AsynchDNS IDN IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz TLS-SRP HTTP2 UnixSockets HTTPS-proxy PSL

可以看到在Features行有输出HTTP2，则说明我使用的curl支持http2.0

那curl如何使用http2.0进行下载呢？查看curl的help帮助

# curl -help |egrep http
 -0, --http1.0       Use HTTP 1.0
     --http1.1       Use HTTP 1.1
     --http2         Use HTTP 2
     --http2-prior-knowledge Use HTTP 2 without HTTP/1.1 Upgrade

则可以看到使用**--http2.0** 或者 --http2-prior-knowledge 即可。此处nginx仅仅支持http2.0，还不支持从http1.1协商协议升级到http2.0，所以暂时用 --http2-prior-knowledge下载，命令如下：

# curl -v --http2-prior-knowledge http://192.168.116.130:80/a.mp4 -o a1.mp4
*   Trying 192.168.116.130...
* TCP_NODELAY set
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Connected to 192.168.116.130 (192.168.116.130) port 80 (#0)
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0x7fffca8c5580)
> GET /a.mp4 HTTP/2  #已经使用http.20访问
> Host: 192.168.116.130
> User-Agent: curl/7.58.0
> Accept: */*
>
* Connection state changed (MAX_CONCURRENT_STREAMS updated)!
< HTTP/2 200  # 服务器响应也是http2.0协议
< server: nginx/1.18.0
< date: Sat, 05 Sep 2020 15:14:50 GMT
< content-type: text/plain
< content-length: 41780
< last-modified: Wed, 24 Jun 2020 12:11:53 GMT
< etag: "5ef34309-a334"
< accept-ranges: bytes
<
{ [13122 bytes data]
100 41780  100 41780    0     0  4080k      0 --:--:-- --:--:-- --:--:-- 4533k
* Connection #0 to host 192.168.116.130 left intact

http2.0 特性验证

头部压缩

可以看到对http request进行了头部压缩，当然也会对http response进行压缩，这里不在叙述。

协议其他特性需后续继续研究。

nginx支持http2.0