Custom CA Support for Insomnia

Run following scripts as root

1. Install custom CA (Ubuntu)

cp your-ca.crt /usr/local/share/ca-certificates/
dpkg-reconfigure ca-certificates

2. Make Insomnia to use system CA

Change the version number (i.e. 2021.3.0) accordingly:

rm /tmp/insomnia_2021.3.0/ca-certs.pem
echo "L+ /tmp/insomnia_2021.3.0/ca-certs.pem - - - - /etc/ssl/certs/ca-certificates.crt" \
    > /usr/lib/tmpfiles.d/insomnia.conf
systemd-tmpfiles --create /usr/lib/tmpfiles.d/insomnia.conf

On Ubuntu:

• Install Insomnia by apt

  echo "deb [trusted=yes arch=amd64] https://download.konghq.com/insomnia-ubuntu/ default all" |
    sudo tee /etc/apt/sources.list.d/insomnia.list
  apt update
  apt install insomnia
  

• Update CA for Insomnia

  echo "L+ /tmp/insomnia_$(dpkg -s insomnia | grep Version | awk '{print $2}')\
  /ca-certs.pem - - - - /etc/ssl/certs/ca-certificates.crt" \
    > /usr/lib/tmpfiles.d/insomnia.conf &&
    systemd-tmpfiles --create /usr/lib/tmpfiles.d/insomnia.conf
  

Credits: Force Insomnia to use the system trust store