Linux

Linux doesn't have one universal proxy setting — there's the shell environment, the desktop environment (GNOME / KDE), and per-app config. This page covers the patterns you actually need.

Environment variables (cli + most apps)

The de-facto standard. Works for curl, wget, apt, pip, npm, git, and most server software.

export http_proxy="http://helo_s1a2b3c4d5e-type-res-region-us:[e-mail]:7777"
export https_proxy="$http_proxy"
export no_proxy="localhost,127.0.0.1,.local"
# Also set the uppercase variants — some apps only honor those:
export HTTP_PROXY="$http_proxy"
export HTTPS_PROXY="$https_proxy"
export NO_PROXY="$no_proxy"

Put it in ~/.bashrc, ~/.zshrc, or /etc/environment for persistence.

GNOME

gsettings set org.gnome.system.proxy mode 'manual'
gsettings set org.gnome.system.proxy.http  host 'gate.helodata.io'
gsettings set org.gnome.system.proxy.http  port 7777
gsettings set org.gnome.system.proxy.https host 'gate.helodata.io'
gsettings set org.gnome.system.proxy.https port 7777

GNOME's proxy dialog does not store credentials — set them via the secret-tool or per-app. Easier: just use envvars from a terminal-launched session.

KDE

System Settings → Network → Proxy → Use manually specified proxy. Fill the same host/port. KDE stores creds in KWallet.

apt (Debian / Ubuntu)

Create /etc/apt/apt.conf.d/99helo-proxy:

Acquire::http::Proxy "http://helo_s1a2b3c4d5e-type-res-region-us:[e-mail]:7777";
Acquire::https::Proxy "http://helo_s1a2b3c4d5e-type-res-region-us:[e-mail]:7777";

yum / dnf (RHEL / Fedora)

Add to /etc/yum.conf (yum) or /etc/dnf/dnf.conf (dnf):

proxy=http://gate.helodata.io:7777
proxy_username=helo_s1a2b3c4d5e-type-res-region-us
proxy_password=PASSWORD

Docker

Daemon-level (affects image pulls):

mkdir -p /etc/systemd/system/docker.service.d
cat > /etc/systemd/system/docker.service.d/proxy.conf <<EOF
[Service]
Environment="HTTP_PROXY=http://helo_s1a2b3c4d5e-type-res-region-us:[e-mail]:7777"
Environment="HTTPS_PROXY=http://helo_s1a2b3c4d5e-type-res-region-us:[e-mail]:7777"
EOF
systemctl daemon-reload
systemctl restart docker

Container-level — pass --env http_proxy=… per docker run or build.

systemd services

For a service to pick up a proxy, add to its unit file:

[Service]
Environment="HTTP_PROXY=http://helo_s1a2b3c4d5e-type-res-region-us:[e-mail]:7777"
Environment="HTTPS_PROXY=http://helo_s1a2b3c4d5e-type-res-region-us:[e-mail]:7777"

then systemctl daemon-reload && systemctl restart <service>.

Verify

curl https://ipv4.icanhazip.com

Common pitfalls

• Case-sensitive envvars — many apps only respect lowercase http_proxy, some only uppercase. Set both.
• localhost bypass missing — without no_proxy=localhost, local dev servers route through helodata and fail.
• Special characters in password — URL-encode (@ → %40, : → %3A) when embedding in http_proxy.