> For the complete documentation index, see [llms.txt](https://docs.speedproxies.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.speedproxies.net/proxies/residential-proxies/important.md).

# Important

- [Authentication](https://docs.speedproxies.net/proxies/residential-proxies/important/authentication.md)
- [Response Codes](https://docs.speedproxies.net/proxies/residential-proxies/important/response-codes.md)
- [Restricted Targets](https://docs.speedproxies.net/proxies/residential-proxies/important/restricted-targets.md)