netcat创建TCP server和TCP client连接

1. 安装netcat

$ sudo yum install netcat

2. 启动TCP server

$ nc -l <port>

3. 启动TCP client连接

$ echo "Hello" | nc localhost <port>

如果只发送一个消息则：

$ echo "Hello" | nc -N localhost <port>

-N shutdown(2) the network socket after EOF on the input. Some servers require this to finish their work.

4. 连接TLS端口

$ nc --ssl-cert cert.pem --ssl-key key.pem --ssl-trustfile ca.pem <server> <TLSPort>

5. 通过proxy访问远程http服务

$ nc <proxy-host> <proxy-port>
CONNECT <server-host>:<host-port> HTTP/1.1
Host: <proxy-host>:<proxy-port>

< HTTP/1.0 200 Connection established

GET /tsam HTTP/1.1
Host: <server-host>:<server-port>
Accept: */*

< HTTP/1.1 200 OK
< Content-Type: text/html; charset=UTF-8
< ...