What is MIME type "text/x-koka"?

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

The MIME type text/x-koka denotes plain text files that contain Koka source code. It signals that the content is human-readable programming code meant for tools that process text rather than binary data.

Files of this type usually bear the KK extension. They are used during the development of programs written in the Koka language.

It enables text editors to apply syntax highlighting specific to Koka.
It helps compilers and development tools recognize and process Koka code efficiently.
The "x-" prefix marks it as a non-standard, experimental MIME type.

For more details on how MIME types work and their practical use in programming, you might check references like IANA Media Types.

Associated file extensions

.kk

Usage Examples

HTTP Header

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


    Content-Type: text/x-koka

HTML

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


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

Associated file extensions

.kk

FAQs

What kind of content does text/x-koka represent?

The MIME type text/x-koka represents source code written in the Koka programming language. These are plain text files, typically with the .kk extension, that contain human-readable logic handling algebraic effects and functional programming constructs.

How do I configure an Apache server to serve Koka files correctly?

To ensure Apache serves .kk files with the correct MIME type rather than as generic binary data, add the following line to your .htaccess file or main configuration:
AddType text/x-koka .kk

How do I add support for text/x-koka in Nginx?

You can register the MIME type in your nginx.conf or mime.types file. Add the following entry inside the types block:
text/x-koka kk;
This ensures browsers and tools recognize the file as Koka source code.

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

The x- prefix indicates that text/x-koka is a non-standard or experimental subtype not officially registered with the IANA. While it is the de facto standard for identifying Koka files, it is defined by the community and language developers rather than a global standards body.

Can web browsers execute text/x-koka files directly?

No, web browsers cannot natively execute Koka source code. If you navigate to a file served as text/x-koka, the browser will typically display it as plain text or ask to download it. To run Koka in a web environment, the code usually needs to be compiled to JavaScript first.

What should I do if my browser downloads the .kk file instead of displaying it?

This usually happens if the server sends the file as application/octet-stream. You can fix this by configuring your web server to send the Content-Type: text/x-koka (or text/plain) header for .kk files, which allows the browser to render the text inline.

Which software can open text/x-koka files?

Since these are plain text files, you can open them with any code editor, such as VS Code, Sublime Text, or Notepad++. For the best experience, install a Koka language extension to enable syntax highlighting and IntelliSense for the .kk format.

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.