Linux Ask!

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Dec 222010

Get HTTP request with nc command


nc command is a very useful tool for network diagnosis, e.g. when you want to know the exact requests sent by your HTTP client (e.g. browser) to your web server, you can easy test with nc.

1. In your server, start nc and listen on port 80

# sudo nc -l -p 80

2. In your browser, type the server IP address.

3. In your shell, HTTP requests will be printed.

GET / HTTP/1.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv: Gecko/20090712 Firefox/3.5.3
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Nov 082010

Emulate telnet using nc


Telnet is a very useful tool for connecting to remote server, such as SMTP. However, you can replace the command telnet by nc, with the exact functionality.

Example: Connect to the local SMTP server.

# nc localhost 25