Add image filename in HTTP Header.
There are no file name in HTTP header.
This mean, when downloading image to "Save This Image", it's filename is default of browser.
But in mobile, it's file name likes 'download.bin'! It is not iamge extensions!
Please add image filename in http header for support mobile and old browser.
We’ll close this UserVoice forum, this issue can now be tracked at https://github.com/andrieslouw/imagesweserv/issues/78