If you're using Debian or derivative distributions (like Ubuntu and friends), you can install catch-http using the deb package, if you don't have installed tcpflow or libmp3-tag-perl, it will automatically install it for you.
Just download catch-http:
http://sourceforge.net/projects/catchhttp/files/latest/download
Go to your downloads directory and double click the deb package, or in the terminal, you can install catch-http using dpkg (in this case the 1.0-1 version, but it can change):
sudo dpkg -i catch-http_1.0-1_all.deb
or
su dpkg -i catch-http_1.0-1_all.deb
If you are using another distro, keep reading.
catch-http uses this (very cool) programs:
On Debian (or friends) you can install it from the terminal:
sudo apt-get install libmp3-tag-perl tcpflow
or
su apt-get install libmp3-tag-perl tcpflow
You can clone the catch-http repository:
git clone git://git.code.sf.net/p/catchhttp/code catchhttp-code
Just copy catch-http to the binary directory and make sure it has execute permission.
sudo cp catch-http /usr/bin/ sudo chmod +x /usr/bin/catch-http
or
su cp catch-http /usr/bin/ chmod +x /usr/bin/catch-http