> For the complete documentation index, see [llms.txt](https://developers.docs.bantufoundation.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.docs.bantufoundation.org/api/errors/index.md).

# Index

After processing a request, Horizon returns a success or error response to the client. A success response will return a Status Code of 200, and an error response will return a Status Code in the range of 4XX - 5XX along with additional information about why the request could not complete successfully.

There are two categories of errors: [HTTP Status Codes](/api/errors/http-status-codes/index.md) and [Result Codes](/api/errors/result-codes/index-1.md). Result Codes only follow a Transaction Failed (400) HTTP Status Code.

Error Categories

| [HTTP Status Codes](https://developers.stellar.org/api/errors/http-status-codes/) | Errors that occur at the Horizon Server level. |
| --------------------------------------------------------------------------------- | ---------------------------------------------- |
| [Result Codes](https://developers.stellar.org/api/errors/result-codes/)           | Errors that occur at the Stellar Core level.   |