uses-proxy

Check if a url shall be proxied through a http(s) proxy

Implements the recommendations from https://about.gitlab.com/blog/2021/01/27/we-need-to-talk-no-proxy/

Detects and uses http(s)_proxy and no_proxy environment variables.

• Environment variables lowercase precedence. no_proxy comes before NO_PROXY
• Matches suffixes
• Does not strip leading .
• * matches all hosts
• No support for regexes.
• Supports CIDR Blocks
• Does not match loopback IPs

usage

npm i uses-proxy

import { usesProxy, shouldProxy } from 'uses-proxy'
const {
  proxyUri, // proxy uri from https_proxy, http_proxy, ...
  protocol, // used protocol of proxy
  noProxy  // no_proxy env var content
} = usesProxy()

const matcher = shouldProxy({
  proxyUri,
  noProxy: noProxy || 'localhost,.tempuri.org'
})

matcher('localhost') // >> false
matcher('test.com') // >> true
matcher('test.tempuri.org') // >> false
matcher('tempuri.org') // >> true

license

MIT licensed