# Response codes for Proxies

The most common response codes when using Oxylabs’ Proxies include:

* 400 Bad Request
* 407 Proxy Authentication Required
* 500 Internal Server Error
* 502 Bad Gateway
* 522 Timeout
* 525 No Exit Found

For detailed explanations on what each of these response codes mean, visit our [documentation](https://developers.oxylabs.io/proxies/residential-proxies/additional-information).

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