0006-00000204

Problem description

The policy form field in a PostObject request does not contain a valid JSON structure.

Cause

OSS first decodes the value of the policy form field from Base64. The request fails if the decoded value is not a valid JSON structure.

Example

None

Solutions

• Ensure the policy form field value is a valid JSON structure before encoding. To generate the final value, first UTF-8 encode the JSON string, and then Base64 encode the result.

  {
    "expiration": "2014-12-01T12:00:00.000Z",
    "conditions": [
      {"bucket": "johnsmith" },    
      ["content-length-range", 1, 10],
      ["eq", "$success_action_status", "201"],
      ["starts-with", "$key", "user/eric/"],
      ["in", "$content-type", ["image/jpeg", "image/png"]],
      ["not-in", "$cache-control", ["no-cache"]]
    ]
  }

• If the content-length-range parameter is included in the Conditions list of a request, both the minimum and maximum allowed sizes of the uploaded Object must be positive integers. For example, ["content-length-range", 1, 10].

References

• For more information about Post Policy, see Appendix: Post Policy.

• For an example of a direct form upload to OSS from a web client, see JavaScript client-side signature direct upload.

• For common errors and troubleshooting methods when calling the PostObject operation, see Post Object Errors and Troubleshooting.