The most important HTTP status codes are shown in the following table.
In the individual queries the possible error messages incl. HTTP status codes are listed in more detail.


Learn about the most important HTTP status codes and their corresponding error messages in this document. Discover the meanings behind status codes such as 200, 204, 400, 401, 404, 405, and 500, and enhance your understanding of web server responses.

Error codes

HTTP status codes

NameChatbot

Limitations

ENGINE4.API

Introduction

Manage ClientSecrets

Authentication

Definitions

Data types

Data structures

Error messages

Determining Custom_XXX-Propertynamen and EntityIds

Creating and deleting object hierarchies

Best Practises

Examples

Name	Code	Description
OK	200	The request was successfully completed.
NoContent	204	The request was successfully performed, but the response still has no content.
BadRequest	400	The request could not be understood by the server due to incorrect syntax.
Unauthorized	401	The request requires user authentication.
NotFound	404	The requested resource does not exist on the server.
MethodNotAllowed	405	The method of the request is known but not supported by the target resource. (GET / POST API call mixed up!).
TooManyRequests	429	The request was blocked because too many requests were sent in a certain period of time. Response may include the HTTP header field "Retry-After" in seconds. For example: Retry-After: 60
InternalServerError	500	An unexpected error occurred on the server. Calls for which the API user has no rights are also returned with 500.