application/zip
applicationThe MIME type for ZIP archive files. Use with Content-Disposition: attachment;filename='archive.zip' for download endpoints. application/zip is the correct IANA-registered type; application/x-zip-compressed and application/x-zip are legacy variants still accepted by most parsers.
Details
application/zip is the IANA-registered type for ZIP archives. RFC 1951 defines the deflate compression algorithm used by ZIP.
Common non-standard variants (still widely encountered): application/x-zip-compressed – Windows IIS legacy application/x-zip – legacy application/octet-stream – when type is unknown
All of the above are generally accepted by ZIP parsers and browsers, but use application/zip for new implementations.
File download: Content-Disposition: attachment;filename="archive.zip" is essential to prevent browsers from attempting to open or preview ZIP files.
Common use
Archive downloads, bulk export endpoints, dependency bundles