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Cloud Object Storage
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    Troubleshooting

    Last updated: 2024-02-02 14:36:36
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      Overview

      If a COS request fails when calling this SDK, it will throw a CosClientException (client exception) or CosServerException (server exception).
      The CosClientException results from unexpected interaction issues between the client and the COS server, such as a failure to connect to the server, a failure to parse the data returned by the server, or the occurrence of an IO exception when reading a local file, etc.
      The CosServerException occurs when the client interacts with the COS server normally, but the operation fails. For example, the client accesses a bucket that does not exist, deletes a file that does not exist, or does not have the permission to perform an operation, etc.

      Client Exceptions

      Inherited from System.ApplicationException, CosClientException is used in the same way as System.ApplicationException. An additional member errorCode is also added, as shown below:
      Member
      Description
      Type
      errorCode
      Client error code, such as 10000, which indicates a parameter verification failure. For more information, see Error Codes
      int

      Server Exceptions

      A CosServiceException contains the status code returned by the server, the requestid, and the error details. After an exception is captured, we recommended that you print out the entire exception as it contains necessary factors for troubleshooting. The member variables of the exception are described as follows:
      Member
      Description
      Type
      requestId
      Request ID, used to identify a request. It is very important for troubleshooting.
      string
      statusCode
      Status code in the response. A 4XX status code represents a request failure caused by the client, and a 5XX status code represents a failure caused by a server exception. For more information, see COS Error Codes.
      string
      errorCode
      Error code returned by the body when the request fails. For more information, see Error Codes.
      string
      errorMessage
      Error message returned by the body when the request fails. For more information, see Error Codes.
      string

      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.
      
      3. Enter RequestId and click Diagnose.
      4. Wait and view the diagnostic result.
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