{"id":"image-vnd-airzip-accelerator-azv","mimeType":"image/vnd.airzip.accelerator.azv","name":"AirZip Accelerator Image","shortName":"AZV","category":"Legacy \u0026 Proprietary","extensions":[".azv"],"description":"The image/vnd.airzip.accelerator.azv MIME type represents a proprietary image format developed by AirZip, Inc. for their Web Accelerator software. Popular during the dial-up internet era (late 1990s to early 2000s), it heavily compressed standard web images (like JPEG and GIF) on the fly via a proxy server to dramatically speed up page loading times for low-bandwidth users.","seo":{"title":"image/vnd.airzip.accelerator.azv MIME Type | Developer Reference","description":"Complete reference for the image/vnd.airzip.accelerator.azv MIME type: history, dial-up web acceleration, HTTP headers, and technical specifications.","faqs":[{"question":"What is an AZV file?","answer":"An AZV file is a proprietary compressed image generated by the legacy AirZip Web Accelerator. A proxy server would intercept standard web images, compress them into the AZV format, and send them to the user's AirZip client software to decode, saving bandwidth over slow dial-up connections."},{"question":"Can I open an image/vnd.airzip.accelerator.azv file today?","answer":"No modern web browsers or image viewers support the AZV format natively. Opening it would require the original, obsolete AirZip Web Accelerator client software running on a legacy operating system."},{"question":"Why does the MIME type start with 'vnd.'?","answer":"The 'vnd.' prefix indicates that this is a vendor-specific MIME type officially registered with IANA by a commercial entity (AirZip, Inc.). It ensures that their proprietary software could handle these files without conflicting with standard web MIME types."}]},"index":{"compression":["Lossy (Proprietary)","Lossless (Proprietary)"],"browserSupport":{"score":1,"label":"None"},"commonUses":["Dial-up Web Acceleration","Bandwidth Optimization (Historical)","Legacy Proxy Servers"]},"technical":{"magicBytes":{"hex":"Unknown (Proprietary)","ascii":"Unknown"},"container":"Proprietary AirZip Container","compressionAlgorithm":["AirZip Proprietary Compression"],"colorDepth":["8-bit (Indexed)","24-bit (RGB)"],"transparency":false,"animation":false,"metadata":{"exif":false,"xmp":false,"iccProfile":false},"alphaChannel":false,"progressiveLoading":true,"hdrSupport":false},"history":{"developer":"AirZip, Inc.","released":"1999","specification":"Proprietary (Registered with IANA)"},"browserSupport":{"chrome":false,"chromeVersion":"None","firefox":false,"firefoxVersion":"None","safari":false,"safariVersion":"None","edge":false,"edgeVersion":"None","internetExplorer":false},"softwareSupport":[{"name":"AirZip Web Accelerator (Legacy)","logo":""}],"conversion":{"convertTo":[],"convertFrom":[]},"developer":{"httpHeaders":[{"header":"Content-Type","value":"image/vnd.airzip.accelerator.azv"}],"htmlAccept":"image/vnd.airzip.accelerator.azv, .azv","fileDetection":["Due to its proprietary nature and obscurity, file detection relies almost entirely on the .azv file extension or examining the HTTP Content-Type header from legacy server logs."]},"prosCons":{"pros":["Historically allowed internet users to browse the web up to 5x faster over 56k dial-up modems by drastically reducing image payload sizes","Officially registered in the IANA vendor tree, preventing MIME type conflicts on early web proxy servers"],"cons":["Completely obsolete in the modern broadband era","Closed-source and proprietary, meaning no modern image manipulation libraries (like ImageMagick or libvips) can decode it","Zero support in standard web browsers"]},"specifications":{"url":"https://www.iana.org/assignments/media-types/image/vnd.airzip.accelerator.azv","rfc":"","mimeAliases":[]},"developerSnippets":{"python":"import magic\nprint(magic.from_file('compressed.azv', mime=True)) # Will likely default to 'application/octet-stream' due to lack of magic byte rules","nodejs":"const FileType = require('file-type');\nconst type = await FileType.fromFile('compressed.azv');\nconsole.log(type?.mime); // Standard parsers will not recognize AZV files","go":"import \"net/http\"\n// The standard net/http library cannot detect AZV files internally. You must rely on string matching the .azv extension.","php":"$mime = mime_content_type('compressed.azv');\necho $mime; // Standard server environments will map this to application/octet-stream"},"relatedFormats":[]}