The Custom MIME Types setting allows you to instruct the CDN to interpret file extensions into MIME types for web browsers that rely on MIME type extensions to define display behavior. Custom MIME Types become relevant if your Origin is unable to explicitly set the MIME Type.
MIME Type is used to identify the format of a file so that a browser can render or open the file correctly. MIME stands for Multipurpose Internet Mail Extension.
Custom MIME Types
The Custom MIMETypes setting allows you to map file extensions directly to MIME types. For example, you can tell the CDN if it see the “.jpg” extension, to automatically map that extension to the “image/jpg” MIME type.