Updated on 2024-05-23 GMT+08:00
Why Am I Seeing the Message "No backend available"?
- Check whether the backend service is accessible, and modify the backend service if it is inaccessible.
- Check the ECS security group configurations of the backend service and verify that the required port has been enabled.
- Check whether the backend service address is a public IP address. If yes, enable outbound access on the Gateways > Access Console > Gateway Information page.
- Check whether ACL configurations of the VPC restrict the communication between the API gateway and the subnet where the backend service is located.
- If you use a VPC channel, check whether the service port, health check port, and backend servers of the VPC channel have been correctly configured.
If the VPC channel type is microservice, check whether a route has been added to the gateway. For details, see Load Balance Channel.
Backends of the shared gateway do not support private network load balancers.
Parent topic: API Calling
API Calling FAQs
- What Are the Possible Causes for an API Calling Failure?
- What Should I Do If an Error Code Is Returned During API Calling?
- Why Am I Seeing the Error Message "414 Request URI too large" When I Call an API?
- What Should I Do If "The API does not exist or has not been published in the environment." Is Displayed?
- Why Am I Seeing the Message "No backend available"?
- What Are the Possible Causes If the Message "Backend unavailable" or "Backend timeout" Is Displayed?
- Why Am I Seeing the Message "Backend domain name resolution failed" When a Backend Service Is Called?
- Why Doesn't Modification of the backend_timeout Parameter Take Effect?
- How Do I Switch the Environment for API Calling?
- What Is the Maximum Size of an API Request Package?
- How Do I Perform App Authentication in iOS System?
- Why Can't I Create a Header Parameter Named x-auth-token for an API Called Through IAM Authentication?
- App (Credential) FAQs
- Can Mobile Apps Call APIs?
- Can Applications Deployed in a VPC Call APIs?
- Does APIG Support WebSocket Data Transmission?
- Does APIG Support Persistent Connections?
- How Will the Requests for an API with Multiple Backend Policies Be Matched and Executed?
- Is There a Limit on the Size of the Response to an API Request?
- How Can I Access Backend Services over Public Networks Through APIG?
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