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Is there any way that I can generate Pre-Signed URL's without any expiry date ? I'm developing a Email app where my attachments will be saved in S3. Also please let me know what is the best way to download attachments via JavaScript SDK.
I'm using below code
var params = {Bucket: 'bucket', Key: 'key', Expires: 60}; var url = s3.getSignedUrl('getObject', params); console.log('The URL is', url); 
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Resolution. If you created a presigned URL using a temporary token, then the URL expires when the token expires. The URL expires even if the URL was created with a later expiration time.
It grants restricted access — only one of GET or PUT is allowed for a single URL. Only to a single object — each pre-signed URL corresponds to one object. With a time-constrained — the URL expires after a set timeout.
A presigned URL gives you access to the object identified in the URL, provided that the creator of the presigned URL has permissions to access that object.
You can simply do an HTTP head request to check whether the url exist.
The maximum expiration time for presigned url is one week from time of creation. So there is no way to have a presigned url without expiry time.
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