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    :What do I do if "400 call back error" is returned when I use the Callback parameter?

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    :What do I do if "400 call back error" is returned when I use the Callback parameter?

    Last Updated:Dec 21, 2022

    Issue

    "400 call back error" is returned when the Callback parameter is used.

    Causes

    The preceding issue is caused by one of the following reasons:

    • The response that is returned by the application server does not contain the Content-Length header.

    • The Callback or Callback-var value that is passed in is invalid.

    Solution

    The response that is returned by the application server to Object Storage Service (OSS) must contain the Content-Length header. The size of the response body cannot exceed 1 MB. Check the Callback and Callback-var values that are passed in the Content-Length header. For more information, see Callback.

    Supported scope

    • OSS