http2测试、HTTP/2检测、http2 check、http/2 test
HTTP/2 (超文本传输协议的第2版)，简称h2 ，它是HTTP协议第二个版本，基于TLS/1.2或以上版本的加密连接协议。HTTP/2的标准化工作由Chrome、Opera、Firefox[6]、Internet Explorer 11、Safari、Amazon Silk及Edge等浏览器提供支持。HTTP/2的开发基于SPDY协议的，HTTP2特点有：tls加密传输，TCP多路复用，HTTP header头压缩等。我们传统https站点，采用http2后，页面加载速度会更快、带宽消耗会降低。目前http2在国内大型站点已经被使用，如果我们站点已经申请好了https 证书，只需要修改web 容器配置，就可以让它支持HTTP2。 当然，http2配置有更高要求，如果你站点已经启用http2 ，可以通过该工具测试一下，是否真的生效了。
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不支持HTTP2！
Trying 220.181.38.150:443...
TCP_NODELAY set
Connected to www.baidu.com (220.181.38.150) port 443 (#0)
Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
successfully set certificate verify locations:
TLSv1.2 (OUT), TLS handshake, Client hello (1):
TLSv1.2 (IN), TLS handshake, Server hello (2):
NPN, negotiated HTTP1.1
TLSv1.2 (IN), TLS handshake, Certificate (11):
TLSv1.2 (IN), TLS handshake, Server key exchange (12):
TLSv1.2 (IN), TLS handshake, Server finished (14):
TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
TLSv1.2 (OUT), TLS handshake, Next protocol (67):
TLSv1.2 (OUT), TLS handshake, Finished (20):
TLSv1.2 (IN), TLS change cipher, Change cipher spec (1):
TLSv1.2 (IN), TLS handshake, Finished (20):
SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
Server certificate:
subject: C=CN; ST=beijing; L=beijing; OU=service operation department; O=Beijing Baidu Netcom Science Technology Co., Ltd; CN=baidu.com
start date: May 9 01:22:02 2019 GMT
expire date: Jun 25 05:31:02 2020 GMT
issuer: C=BE; O=GlobalSign nv-sa; CN=GlobalSign Organization Validation CA - SHA256 - G2
SSL certificate verify ok.
Mark bundle as not supporting multiuse
Connection #0 to host www.baidu.com left intact