Overview

If an SDK API call to request the COS service fails, the system will return the error information in the callback.

Sample error

cos.headBucket({
   Bucket: 'examplebucket-1250000000',
   Region: 'COS_REGION',
}, function(err, data) {
   if (err) {
       console.log(err.error);
   }
});

Client Exceptions

Server Exceptions

Using the Diagnosis Tool

COS provides a self-help diagnosis tool to help you quickly locate request problems and debug code.

Directions

1. Copy the request ID (RequestId) returned when the request error occurs.
2. Click Diagnosis Tool.
   Diagnosis Tool

   Click to start diagnosis

   Enter `RequestId` for intelligent diagnosis and obtain basic request information, directions, and diagnosis information to quickly locate request errors.
3. Enter RequestId and click Diagnose.
4. Wait and view the diagnostic result.