Unity3D WebGL + AWS S3: Set correct content-type and content-encoding

update-unity.py

#!/usr/bin/env python3
# coding: utf-8

# Sets the correct content-type and content-encoding for Unity3D files.
# @see https://forum.unity.com/threads/changes-to-the-webgl-loader-and-templates-introduced-in-unity-2020-1.817698/#post-5716621

import boto3

bucket_id = 'unity-model'
folder_prefix = 'model'

# Configure files and content-types
unity_objs = [
	{
		'key': folder_prefix + '/Build/model.data.gz',
		'content_type' : 'application/octet-stream'
	},
	{
		'key': folder_prefix + '/Build/model.framework.js.gz',
		'content_type' : 'application/javascript'
	},
	{
		'key': folder_prefix + '/Build/model.wasm.gz',
		'content_type' : 'application/wasm'
	},
]

# Connect to S3
s3 = boto3.resource( 's3' )

# Set meta data
for obj in unity_objs :
	s3_obj = s3.Object( bucket_id, obj['key'] )
	try :
		response = s3_obj.copy_from( CopySource={ 'Bucket' : bucket_id,
							  'Key' : obj['key'] },
							 ContentType=obj['content_type'],
							 ContentEncoding='gzip',
							 MetadataDirective='REPLACE' )

		if ( response['ResponseMetadata']['HTTPStatusCode'] == 200 ) :
			print( 'SUCCESS - ' + obj['key'] )
		else :
			print( 'ERROR - ' + obj['key'] )
	except :
		print( 'ERROR - ' + obj['key'] )