Problem description
The required expiration field is missing in the policy form field in a PostObject request.
Causes
You initiate a PostObject request to upload an object. However, the required expiration field is missing in the policy form field in the request. As a result, a request error is reported.
Examples
The following sample code provides an example of the policy form field in the JSON format. In this example, the required expiration field is missing.
{
"conditions": [
["content-length-range", 0, 1048576000]
]
}Solutions
Make sure that the policy form field in the JSON format contains both the expiration and conditions fields.
{
"expiration": "2023-02-19T13:19:00.000Z",
"conditions": [
["content-length-range", 0, 1048576000]
]
}References
For more information about the policy form field, see the "Appendix: Policy" section of the PostObject topic.
For more information about how to transfer data from a web client to Object Storage Service (OSS) by using form upload, see Add signatures on the client by using JavaScript and upload data to OSS.
For more information about common errors and troubleshooting methods of the PostObject operation, see PostObject.