sorl-thumbnail cache does not work with AWS S3 Signature Version 4

[dalguji]

After I moved the region of my AWS S3 bucket from Tokyo to Seoul, I realized sorl-thumbnail within my website generates thumbnail images every time it loads the web page and it causes about 15 second delay to load.

I found that it is because my new S3 region, Seoul, provides Signature Version 4 only and it gives the file URL with trailing parameters like ?X-Amz-Algorithm=...&... always.

Do you think there is any solution with sorl-thumbnail codes/settings for this issue? Or should I just upload files as public all the time?

The following are the sample records of thumbnail_kvstore table for your reference.

 sorl-thumbnail||image||e183ee838fe83addfa658220fe30      | {"storage": "sorl.thumbnail.images.UrlStorage", "name": "https://my-bucket.s3.ap-northeast-2.amazonaws.com/work/1.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&X-Amz-Signature=9e035489a1a...117760f1bd5&X-Amz-Date=20160315T091447Z&X-Amz-Credential=AKIA...NNHA%2F20160315%2Fap-northeast-2%2Fs3%2Faws4_request", "size": [1770, 1770]}
 sorl-thumbnail||image||58a51e8097dc5361ef4cec94c73e      | {"storage": "apps.s3utils.MyS3BotoStorage", "name": "cache/ec/d2/ecd2feb7f819e87b1ad7a9a4bf3b21f.jpg", "size": [1000, 1000]}
 sorl-thumbnail||thumbnails||e183ee838fe83ade7a658220fe30 | ["58a51e8097dc2361ef4cec94c73e"]