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When calling an API on COS, errors such as lock timeout, no credential for sign, or signature expiration are reported. What should I do?

Created on 2025-04-11 14:15:20
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When encountering errors such as lock timeout, no credential for sign, or signature expiration while calling an API on Cloud Object Storage (COS), here are some steps you should take:

  1. Lock Timeout: This error usually occurs when a resource is locked for an extended period. To resolve this, you can try the following:

  • Ensure that your application properly releases locks after operations are completed.

  • Increase the lock timeout setting if your application requires more time to complete operations.

    Example: If you're using a distributed lock to manage access to a file in COS, make sure your application releases the lock once the file operation is done.

  1. No Credential for Sign: This error indicates that the request to COS lacks the necessary credentials for signing. To fix this:

  • Verify that your application is correctly configured with the access key ID and secret access key.

  • Ensure that the credentials have not expired and have the necessary permissions to perform the requested operation.

    Example: Check your environment variables or configuration files to ensure the correct credentials are being used.

  1. Signature Expiration: This error happens when the signature used to authenticate the request has expired. To address this:

  • Ensure that your application generates a new signature for each request, especially if the request is delayed.

  • Adjust the timestamp settings if there is a time synchronization issue between your application and COS.

    Example: If your application generates a signature and then sends the request after a delay, the signature might expire. Generate the signature just before sending the request.

For managing credentials and signatures efficiently, you might consider using services like Tencent Cloud's CAM (Cloud Access Management) to manage access keys and permissions securely. Additionally, using Tencent Cloud's STS (Security Token Service) can provide temporary credentials with expiration times, reducing the risk of signature expiration errors.

By following these steps, you can troubleshoot and resolve common errors encountered when calling APIs on COS.