What is MIME type "application/x-wacz"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

application/x-wacz is a container format for web archive files. It packages a complete web capture—pages, images, scripts, and metadata—into one compressed file.
This MIME type helps preserve online content in its original form. It is used to keep interactive elements and design intact for future viewing.

Web Archiving: Capture and store entire websites for offline access.
Digital Preservation: Safeguard dynamic web content, including multimedia and scripts.
Research: Enable analysis of historical web sessions and interactive design.

Files using this MIME type use the WACZ extension. This format is particularly useful in advanced web archiving projects and digital preservation tools. For more technical details, you may visit FileXT.

Associated file extensions

.wacz

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: application/x-wacz

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="application/x-wacz">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');
    
    http.createServer((req, res) => {
      res.setHeader('Content-Type', 'application/x-wacz');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.wacz

FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.