How to do multi-part download using aws sdk js? Is s3.getObject is multipart?

[ArjunMani]

No description provided.

[chrisradek]

@ArjunMani
There are 2 ways to performa a multi-part download form S3, both using the getObject method.

If an object was uploaded using a multi-part upload, then you can use the PartNumber field in the getObject parameters to request a specific part. You can tell if this is the case be calling headObject first and checking the PartsCount field in the response.

Alternatively, you can specify a range of bytes to download and make the getObject call multiple times. There's an example in the documentation

var params = {
Bucket: "examplebucket",
Key: "SampleFile.txt",
Range: "bytes=0-9"
};
s3.getObject(params, function(err, data) {
if (err) console.log(err, err.stack); // an error occurred
else console.log(data); // successful response
/*
data = {
AcceptRanges: "bytes",
ContentLength: 10,
ContentRange: "bytes 0-9/43",
ContentType: "text/plain",
ETag: ""0d94420ffd0bc68cd3d152506b97a9cc"",
LastModified: ,
Metadata: {
},
VersionId: "null"
}
*/
});

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