What is MIME type "application/x-font-speedo"?

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

application/x-font-speedo is a MIME type for a specific kind of font file used in systems that support scalable fonts. It carries data for rendering the font at various sizes with consistent quality.

It is mainly used to deliver Speedo font files. These were most common in specialized or legacy environments and certain desktop publishing setups. The fonts typically use the SPD extension.

Supports scalable font rendering in applications.
Helps maintain clarity when fonts are resized.
Was used in environments with non-standard font formats.
Can be found in legacy systems or niche publishing software.

For more on MIME types and their roles, see MIME Types on MDN.

Associated file extensions

.spd

Usage Examples

HTTP Header

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


    Content-Type: application/x-font-speedo

HTML

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


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

Associated file extensions

.spd

FAQs

Do modern web browsers support application/x-font-speedo?

No, modern browsers like Chrome, Firefox, and Edge do not support Speedo fonts or the application/x-font-speedo MIME type. This format is legacy technology primarily used in older X Window Systems and specialized desktop publishing. For web typography, you should use standard formats like font/woff2 or font/ttf.

How do I configure Apache to serve .spd files?

Since this is a non-standard type, you must manually add the definition to your configuration or .htaccess file. Use the directive AddType application/x-font-speedo .spd to ensure the server sends the correct header for Bitstream Speedo font files.

What is the relationship between this MIME type and the .spd extension?

The application/x-font-speedo MIME type is specifically assigned to files ending in .spd, which contain Bitstream Speedo scalable font data. While the extension identifies the file on the local disk, the MIME type tells the receiving application (like a legacy network client) how to interpret the binary stream.

Should I use application/x-font-speedo for a new website?

No, you should avoid using this format for web development. It lacks support across modern platforms and devices. If you have a Speedo font you need to use, convert it to a web-safe format like WOFF or OpenType using a font conversion tool.

Why does the MIME type start with 'x-'?

The x- prefix indicates that application/x-font-speedo is a non-standard or experimental subtype not formally registered with IANA. It was defined by vendors (specifically for Bitstream technologies) to handle their proprietary format before modern font standards were established.

How can I open or view a file served as application/x-font-speedo?

Standard OS font viewers usually cannot open .spd files directly. You typically need legacy software compatible with the Speedo format or a specialized font editor like FontForge to convert the file into a usable format like TrueType (.ttf).

General 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.