The user initiated a PostObject request, but in the policy form field, when the data type of an element in conditions is a List and the first element is eq or starts-with, the second element is neither a string type nor starts with $.

Example

Assume the text for constructing the policy form field is as follows:

{​
  "conditions": [​
    ["eq",123,"examplebucket"]​
  ],​
  "expiration":"2023-12-28T15:04:05Z"​
}​

If used to construct the policy form field and the request is sent, this error is returned.

Solution

Refer to PostObject to correctly construct the request form field, ensuring the policy form field value is valid.

Last updated: 2026.10.12 10:21:00

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