How to change content type of Amazon S3 Objects

Question

The objects in my Amazon S3 bucket are all of the content type application/octet-stream. Some of these objects are PDFs, sometimes images like JPG,

Answer 1

This is how you can set Content-Type for all files of type *.png

aws s3 cp \
       s3://BUCKET-NAME/ \
       s3://BUCKET-NAME/ \
       --exclude '*' \
       --include '*.png' \
       --no-guess-mime-type \
       --content-type="image/png" \
       --metadata-directive="REPLACE" \
       --recursive