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命令行访问https(转载，略有改动)

由于现在很多的互联网，页面开始使用https，造成telnet 的http方式无法访问（文档地址：https://www.cnblogs.com/moonson/archive/2011/11/18/2253630.html），特补充下文：

1、安装openssl，对应下载地址：http://slproweb.com/products/Win32OpenSSL.html。如链接失效，请自行找其它资源。

2、将openssl 的bin目录（D:\Program Files\OpenSSL-Win64\bin）加入系统环境变量PAth中。

3、使用命令访问

openssl s_client -connect www.baidu.com:443
知识兔

　　返回证书信息类似下文：

CONNECTED(000001A0)
depth=1 C = BE, O = GlobalSign nv-sa, CN = GlobalSign Organization Validation CA - SHA256 - G2
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 C = CN, ST = beijing, L = beijing, OU = service operation department, O = "Beijing Baidu Netcom Science Technology Co., Ltd", CN = baidu.com
verify return:1
---
Certificate chain
0 s:C = CN, ST = beijing, L = beijing, OU = service operation department, O = "Beijing Baidu Netcom Science Technology Co., Ltd", CN = baidu.com
i:C = BE, O = GlobalSign nv-sa, CN = GlobalSign Organization Validation CA - SHA256 - G2
1 s:C = BE, O = GlobalSign nv-sa, CN = GlobalSign Organization Validation CA - SHA256 - G2
i:C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA
---
Server certificate.....

GET / HTTP/1.1
HOST: www.baidu.com
//再敲两个回车
知识兔

返回网页代码如下：

HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: no-cache
Connection: Keep-Alive
Content-Length: 14722
Content-Type: text/html
Date: Thu, 17 Oct 2019 08:52:58 GMT
P3p: CP=" OTI DSP COR IVA OUR IND COM "
P3p: CP=" OTI DSP COR IVA OUR IND COM "
Pragma: no-cache
Server: BWS/1.1
Set-Cookie: BAIDUID=DCFC93ADF1F24B901BE236D73D94F686:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Set-Cookie: BIDUPSID=DCFC93ADF1F24B901BE236D73D94F686; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.b...

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