If your request method is not supported by Horizon, Horizon will return a not_implemented error. This is analogous to a HTTP 501 Error.
If you are encountering this error, Horizon does not have the functionality you are requesting yet.
As with all errors Horizon returns, not_implemented follows the Problem Details for HTTP APIs draft specification guide and thus has the following attributes:
|The identifier for the error. This is a URL that can be visited in the browser
|A short title describing the error
|An HTTP status code that maps to the error
|A more detailed description of the error
|A token that uniquely identifies this request. Allows server administrators to correlate a client report with server log files