> ## Documentation Index
> Fetch the complete documentation index at: https://help.decodo.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Response Codes

> Residential Proxy Error Definitions

## Retrieving Error Codes

Residential proxies also return a specific definition of the error code in the response headers.

For example, you can send a `cURL` with `verbose` mode enabled to gain more information about the connection headers. To enable `verbose` mode, simply use the `-v` /`--verbose` option in the command just before the proxy details:

```shellscript cURL theme={null}
curl -v -U "username:password" -x "gate.decodo.com:7000" "https://ip.decodo.com/json"
```

If the connection was unsuccessful, you will find the error code and its description in the `x-error-message` header in the response:

```text Response theme={null}
< HTTP/1.1 407 Proxy Authentication Required
< proxy-authenticate: Basic
* Authentication problem. Ignoring this.
< x-error-message: Access denied. You've reached your current traffic limit. Please contact support or your account manager to review or adjust your limit.
< content-length: 136
< content-type: text/plain
< 
* CONNECT tunnel failed, response 407
* Closing connection
curl: (56) CONNECT tunnel failed, response 407
```

## Error Code Reference

| Error Code | Description                                                                                                                                      |
| :--------- | :----------------------------------------------------------------------------------------------------------------------------------------------- |
| `400`      | `Bad request. Please review the format and try sending it again.`                                                                                |
| `400`      | `Bad request. Received an invalid HTTP request. Please try your request again.`                                                                  |
| `403`      | `Access denied. You’re trying to access a restricted parameter. Please contact support if you need assistance.`                                  |
| `403`      | `Access denied. You’re trying to access a restricted target. Please contact support if you need assistance.`                                     |
| `407`      | `Access denied. You’ve reached your current traffic limit. Please contact support or your account manager to review or adjust your limit.`       |
| `407`      | `Access denied. We couldn’t log you in with the details provided. Please confirm your username and password and try again.`                      |
| `500`      | `Internal server error. Please try again.`                                                                                                       |
| `502`      | `Bad gateway. An error occurred while routing your request. Please try again.`                                                                   |
| `502`      | `Bad gateway. The connection to the client was interrupted. Please reconnect and try your request again.`                                        |
| `502`      | `Bad gateway. The session has failed. Please start a new session and try again.`                                                                 |
| `502`      | `Bad gateway. We couldn’t find a suitable exit node and the session has ended. Please adjust your filters or start a new session and try again.` |
| `502`      | `Bad response. Received an invalid HTTP response from the destination. Please try your request again.`                                           |
| `502`      | `Bad response. We received an unexpected or invalid response from the destination. Please try your request again.`                               |
| `504`      | `Timeout. The request took too long to complete and has timed out. Please try sending it again.`                                                 |
| `522`      | `Bad response. We received an unexpected or invalid response from the destination. Please try your request again.`                               |
| `522`      | `Timeout. The request took too long to complete and has timed out. Please try sending it again.`                                                 |
| `522`      | `Timeout. Couldn’t reach the destination in time. Please confirm that the target URL is correct and try again.`                                  |

***

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