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: Standard Status Codes and Horizon-Specific Status Codes.

HTTP Status Code Types

Standard Status Codes	Generic HTTP responses.
Horizon-Specific Status Codes	Errors that are unique to Horizon.