Get signature credentials before uploading seed image

Return value

parameterdescription
datasigned url

After getting the signed url, use the Alibaba Cloud SDK to upload the file. do not modify the signature link, otherwise the upload will fail. the signature link is valid for 5 minutes.

Upload files using "put" request, example:

with open(file, 'rb') as f:  
    requests.put(sign_url, f)
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