Scripting an HTTP header request with netcat

Question

I\'m trying to play around with netcat to learn more about how HTTP works. I\'d like to script some of it in bash or Perl, but I\'ve hit upon a stumbling block early on in m

Answer 1

This line will also work as equivalent:

echo -e "HEAD / HTTP/1.1\nHost: 10.1.1.2\nConnection: close\n\n\n\n" | netcat 10.1.1.2 80

Answer 2

Another way is to use what is called the 'heredoc' convention.

$ nc -n -i 1 10.1.1.2 80 <<EOF
> HEAD / HTTP/1.0
>
> EOF

Answer 3

You need two lots of "\r\n", and also to tell netcat to wait for a response. printf "HEAD / HTTP/1.0\r\n\r\n" |nc -n -i 1 10.1.1.2 80 or similar should work.

Answer 4

Another way to get nc to wait for the response is to add a sleep to the input. e.g.

(printf 'GET / HTTP/1.0\r\n\r\n'; sleep 1) | nc HOST 80

Answer 5

You can use below netcat command to make your instance webserver:

MYIP=$(ifconfig eth0|grep 'inet addr'|awk -F: '{print $2}'| awk '{print $1}')
while true; do echo -e "HTTP/1.0 200 OK\r\n\r\nWelcome to $MYIP" | sudo nc -l -p 80 ; done&