For some JPEG profile pictures, the response “content-type” is “binary/octet-stream” instead of “image/jpeg”.
Examples:
https://static-cdn.jtvnw.net/jtv_user_pictures/8cabb91c-1fea-41f3-ac28-2938e918ead4-profile_image-300x300.jpeg
https://static-cdn.jtvnw.net/jtv_user_pictures/80c7f68d-8d5e-45cd-a228-65466e37205f-profile_image-300x300.jpeg
