Error Codes

Table 1 lists the error codes that you may encounter when calling APIs.

For details about the error codes that may occur when you manage APIs, see section "Error Codes" in the API Gateway API Reference.
If an error occurs when you use API Gateway, find the error message and description in the following table according to the error code, for example, APIG.0101. The error messages are subject to change without prior notice.

**Table 1** Error codes
Error Code	Error Message	HTTP Status Code	Description	Solution
APIG.0101	The API does not exist or has not been published in the environment.	404	The API does not exist or has not been published in the environment.	Check whether the domain name, method, and path are consistent with those of the registered API. Check whether the API has been published. If it has been published in a non-production environment, check whether the X-Stage header in the request is the environment name. Check whether the domain name used to call the API has been bound to the group to which the API belongs.
APIG.0101	The API does not exist.	404	The API request method does not exist.	Check whether the API request method is the same as the method defined by the API.
APIG.0103	The backend does not exist.	500	The backend service was not found.	Contact technical support.
APIG.0104	The plug-ins do not exist.	500	No plug-in configurations were found.	Contact technical support.
APIG.0105	The backend configurations do not exist.	500	No backend configurations were found.	Contact technical support.
APIG.0106	Orchestration error.	400	An orchestration error occurred.	Check whether the frontend and backend parameters of the API are correct.
APIG.0201	API request error.	400	Invalid request parameters.	Set valid request parameters.
APIG.0201	Request entity too large.	413	The request body exceeds 12 MB.	Reduce the size of the request body.
APIG.0201	Request URI too large.	414	The request URI exceeds 32 KB.	Reduce the size of the request URI.
APIG.0201	Request headers too large.	494	The request headers are too large because one of them exceeds 32 KB or the total length exceeds 128 KB.	Reduce the size of the request headers.
APIG.0201	Backend unavailable.	502	The backend service is unavailable.	Check whether the backend address configured for the API is accessible.
APIG.0201	Backend timeout.	504	The backend service has timed out.	Increase the timeout duration of the backend service or shorten the processing time.
APIG.0201	An unexpected error occurred	500	An internal error occurred.	Contact technical support.
APIG.0202	Backend unavailable	502	The backend is unavailable.	Check whether the backend request protocol configured for the API is the same as the request protocol used by the backend service.
APIG.0203	Backend timeout.	504	The backend service has timed out.	Increase the timeout of the backend service or shorten its processing time.
APIG.0204	SSL protocol is not supported: TLSv1.1	400	The SSL protocol version is not supported.	Use a supported SSL protocol version.
APIG.0301	Incorrect IAM authentication information.	401	The IAM authentication details are incorrect.	Check whether the token is correct.
APIG.0302	The IAM user is not authorized to access the API.	403	The IAM user is not allowed to access the API.	Check whether the user is controlled by a blacklist or whitelist.
APIG.0303	Incorrect app authentication information.	401	The app authentication details are incorrect.	Check whether the request method, path, query strings, and request body are consistent with those used for signing; check whether the date and time on the client are correct; and check whether the signing code is correct by referring to section "Calling APIs Through App Authentication" in the Developer Guide.
APIG.0304	The app is not authorized to access the API.	403	The app is not allowed to access the API.	Check whether the app has been authorized to access the API.
APIG.0305	Incorrect authentication information.	401	The authentication information is incorrect.	Check whether the authentication information is correct.
APIG.0306	API access denied.	403	Access to the API is not allowed.	Check whether you have been authorized to access the API.
APIG.0307	The token must be updated.	401	The token needs to be updated.	Obtain a new token from IAM.
APIG.0308	The throttling threshold has been reached.	429	The throttling threshold has been reached.	Try again after the throttling resumes. If the number of subdomain requests per day is reached, bind an independent domain name to the API.
APIG.0310	The project is unavailable.	403	The project is currently unavailable.	Select another project and try again.
APIG.0311	Incorrect debugging authentication information.	401	The debugging authentication details are incorrect.	Contact technical support.
APIG.0401	Unknown client IP address.	403	The client IP address cannot be identified.	Contact technical support.
APIG.0402	The IP address is not authorized to access the API.	403	The IP address is not allowed to access the API.	Check whether the IP address is controlled by a blacklist or whitelist.
APIG.0404	Access to the backend IP address has been denied.	403	The backend IP address cannot be accessed.	Check whether the backend IP address or the IP address corresponding to the backend domain name is accessible.
APIG.0502	The app has been frozen.	405	The app has been frozen.	Check whether your account balance is sufficient.
APIG.0601	Internal server error.	500	An internal error occurred.	Contact technical support.
APIG.0602	Bad request.	400	Invalid request.	Check whether the request is valid.
APIG.0605	Domain name resolution failed.	500	Domain name resolution failed.	Check whether the domain name is correct and has been bound to a correct backend address.
APIG.0606	Failed to load the API configurations.	500	API configurations could not be loaded.	Contact technical support.
APIG.0607	The following protocol is supported: {xxx}	400	The protocol is not supported. Only xxx is supported. xxx is subject to the actual value in the response.	Use HTTP or HTTPS to access the API.
APIG.0608	Failed to obtain the admin token.	500	The tenant details cannot be obtained.	Contact technical support.
APIG.0609	The VPC backend does not exist.	500	The VPC backend service cannot be found.	Contact technical support.
APIG.0610	No backend available.	502	No backend services are available.	Check whether all backend services are available. For example, check whether the API calling information is consistent with the actual configuration.
APIG.0611	The backend port does not exist.	500	The backend port was not found.	Contact technical support.
APIG.0612	An API cannot call itself.	500	An API cannot call itself.	Modify the backend configurations, and ensure that the number of layers the API is recursively called does not exceed 10.
APIG.0613	The IAM service is currently unavailable.	503	IAM is currently unavailable.	Contact technical support.
APIG.0705	Backend signature calculation failed.	500	Backend signature calculation failed.	Contact technical support.
APIG.0802	The IAM user is forbidden in the currently selected region	403	The IAM user is disabled in the current region.	Contact technical support.
APIG.1009	AppKey or AppSecret is invalid	400	The AppKey or AppSecret is invalid.	Check whether the AppKey or AppSecret in the request is correct.