How to Simulate ICAP Traffic to Test ICAP Functionality Using Telnet?

Telnet Installation

Windows:

Make sure Telnet is enabled under "Turn Windows features on or off."

Linux:

Make sure Telnet is installed on your system.

Debian/Ubuntu-based distributions:

sudo apt install telnet -y

RHEL/CentOS/Fedora:

sudo yum install telnet -y

For newer versions (CentOS 8+, RHEL 8+, Fedora):

sudo dnf install telnet -y

Verify Installation:

After installation, check if Telnet is installed by running:

telnet --version

Simulate ICAP traffic using Telnet

1. Open a Telnet Connection

Use the following command in a terminal or command prompt:

telnet <ICAP_SERVER> <ICAP_PORT>

Example:

telnet 192.168.233.132 1344

2. Construct an ICAP Request

After connecting via telnet, Copy and paste the ICAP request. Below is an example request for REQMOD (Request Modification):

ICAP REQMOD Request Example:

REQMOD icap://192.168.233.132/OMSScanReq-AV ICAP/1.0

Host: 192.168.1.100

Encapsulated: req-hdr=0, null-body=120

​

GET /index.html HTTP/1.1

Host: www.example.com

User-Agent: Telnet-ICAP

After typing, press Enter twice to send the request.

If the request is successful, you will see the response as the output.

On the MetaDefender ICAP Console Management