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

# HTTP Status Codes

> Some errors only occur at the Horizon level and are not thrown in Stellar Core. These are usually issues with how the transaction was formed or a conflict between the transaction’s composition and how the Horizon server is setup.

Stellar uses conventional HTTP response codes to indicate the success or failure of an API request. In general:

* Codes in the 2xx range indicate success.
* Codes in the 4xx range indicate an error that failed given the information provided
* Codes in the 5xx range indicate an error with the Horizon server.

There are two types of Status Codes:

| HTTP Status Code Types | |
| - | - |
| [Standard Status Codes](https://developers.stellar.org/docs/data/apis/horizon/api-reference/errors/http-status-codes/standard.md) | Generic HTTP responses. |
| [Horizon-Specific Status Codes](https://developers.stellar.org/docs/data/apis/horizon/api-reference/errors/http-status-codes/horizon-specific) | Errors that are unique to Horizon. |