What is MIME type "application/x-sv4crc"?

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

application/x-sv4crc is a non‐standard MIME type. It designates files that hold cyclic redundancy check (CRC) data. This checksum data is used to verify that file content remains unchanged.

The x- prefix signals that this type is experimental or not widely adopted.
Checksum files like these help software detect errors during file transfers or software updates.

File Integrity Verification: Confirms that data has not been corrupted.
Error Detection: Quickly spots unintended changes or tampering.
Legacy System Use: Often found in environments influenced by older Unix (SVR4) systems.

Files marked as SV4CRC carry this CRC information. Specialized tools or software are needed to read and validate the checksum.
For further details on file extensions and their uses, check out Filext.

Associated file extensions

.sv4crc

Usage Examples

HTTP Header

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


    Content-Type: application/x-sv4crc

HTML

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


    <a href="file.dat" type="application/x-sv4crc">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-sv4crc');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.sv4crc

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.