Proxy Environment Variables Guide
HTTP_PROXY, HTTPS_PROXY, ALL_PROXY, NO_PROXY explained — precedence, pitfalls, and tooling compatibility.
HTTP_PROXY, HTTPS_PROXY, ALL_PROXY, NO_PROXY explained — precedence, pitfalls, and tooling compatibility.
Core variables
- HTTP_PROXY / http_proxy
- HTTPS_PROXY / https_proxy
- ALL_PROXY for any scheme
- NO_PROXY for bypass list
Precedence
Lowercase vs uppercase varies by tool. Explicit client config beats env when both are set.
NO_PROXY
Bypass internal APIs and metadata endpoints. Misconfigured NO_PROXY leaks internal calls through paid proxy egress.
Related: curl configuration.
Need proxies at scale?
proxies.st offers health-checked HTTP and SOCKS pools with dashboard access, API keys, and plain-text bulk feeds for pipelines.
Related guides
Rotating Proxies for Web Scraping at Scale
Rotation strategies, session stickiness, anti-bot considerations, and scraper architecture for high-volume crawling.
Bulk Proxy Lists: Formats, Parsing, and Pipeline Integration
Parse ip:port lists, validate endpoints, version snapshots, and integrate bulk proxy feeds into automation pipelines.