How to exclude certain domains from an npm proxy - proxy

Question

We use npm behind a company firewall and thus use proxy and https-proxy settings in the npm configuration. This works fine as long as all npm modules are loaded from an external registry. But as a matter of fact we also have internal modules on an internal github. The access to these modules must not use the proxy of course. My question is: Can I specify a list of domains in the npm configuration, for which the proxy should not be used? Something like the no_proxy environment variable in the unix shell?

Answer 1

Assuming your environment looks like this:
Build server with internet access only over proxy: your.proxy.host:3128
Local Nexus Registry: https://your.local.nexus.registry/nexus/content/groups/npm/
NPM must use local Nexus Registry. Configuration file: .npmrc
registry = https://your.local.nexus.registry/nexus/content/groups/npm/
You can tell npm to use a proxy by setting the environment variables
http_proxy=http://your.proxy.host:3128
https_proxy=http://your.proxy.host:3128
but then npm will also try to reach your (local) Nexus Registry using the proxy.
You need to have one of the latest npm Versions (npm 2.14.7 works fine) and set an additional environment variable to exclude your Nexus Registry from the proxy:
no_proxy=your.local.nexus.registry

Answer 2

Since NPM 6.4.1, released on 2018-08-22, you can use the noproxy option, even with a custom registry configured.
Example :
npm config set registry "http://<my-npm-registry-host>:<registry-port>"
npm config set proxy "http://<my-proxy-host>:<proxy-port>"
npm config set https-proxy "http://<my-proxy-host>:<proxy-port>"
npm config set noproxy "my-proxy-host" (accepts pattern like *.domain)
Check config :
npm config list
References :
NPM doc for noproxy
NPM changelog
NPM PR #46

Answer 3

to exclude certain domains , you can add below lines in .npmrc
noproxy[]=.local.nexus
noproxy[]=.internal.npm.repo
https://docs.npmjs.com/misc/config#noproxy

Answer 4

As adiesner indicated, you cannot set a noproxy/no_proxy in the npm config, so the only way to do this is via the environment variables:
npm config set registry "your.local.nexus.registry/nexus/content/groups/npm/"
export http_proxy="http://your.proxy.host:3128"
export https_proxy=$http_proxy
export no_proxy="your.local.nexus.registry"

Answer 5

If you are using cntlm you should configure the NoProxy option in the configuration file "/etc/cntlm.conf". For instance,
Username your_user
Domain UCI.CU
Password your_password
Proxy 10.0.0.1:8080
Listen 3128
NoProxy uci.cu, edu.cu, nexus.prod.uci.cu, localhost, 127.0.0.*, 10.*, 192.168.*
Remember that you must restart cntlm: sudo systemctl restart cntlm

Answer 6

For PowerShell, the commands are:
$Env:http_proxy = "http://your.proxy.host:3128"
$Env:https_proxy = "http://your.proxy.host:3128"
$Env:no_proxy = "..."