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I am trying to convert files to gzip files and then upload them to S3. When I check in S3, the files are there but they don't have a type specified. How can I specify the content type?

 for i in testList: with contextlib.ExitStack() as stack: source_file = stack.enter_context(open(i , mode="rb")) destination_file = io.BytesIO() destination_file_gz = stack.enter_context(gzip.GzipFile(fileobj=destination_file, mode='wb')) while True: chunk = source_file.read(1024) if not chunk: break destination_file_gz.write(chunk) destination_file_gz.close() destination_file.seek(0) bucket.upload_fileobj(destination_file, fileName, ContentType='application/gzip')

If I add ContentType as an argument to the last line, I get an error:

"errorMessage": "bucket_upload_fileobj() got an unexpected keyword argument 'ContentType'",
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  • Try ExtraArgs={'Content-Type': 'application/gzip'}. Commented Oct 20, 2021 at 23:12

1 Answer 1

Reset to default
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Use

bucket.upload_fileobj(destination_file, fileName,ExtraArgs={'ContentType': "application/gzip"})

See AWS Content Type Settings in S3 Using Boto3

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2 Comments

this doesn't throw an error but the type is still undefined in S3
you can try also upload_file() where you set the filename so your code is much simpler boto3.amazonaws.com/v1/documentation/api/latest/reference/…