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Update the content-type of an existing key in S3 using boto
import boto
s3 = boto.connect_s3()
bucket = s3.lookup('mybucket')
key = bucket.lookup('mykey')
# Copy the key onto itself, preserving the ACL but changing the content-type
key.copy(key.bucket,, preserve_acl=True, metadata={'Content-Type': 'text/plain'})
key = bucket.lookup('mykey')
print key.content_type

rodvdka commented Oct 11, 2012

Thanks, this helped me a lot dude.

tszming commented Nov 12, 2013

Helped me too, thanks

bsoist commented Feb 28, 2014

Exactly what I was looking for. Thanks!

bucket.lookup(key_name) has been deprecated. Source Boto. Use bucket.get_key(key_name) instead.

thanx for large help!
can copy self is very key idea ;-)

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