What is MIME type "text/x-r-doc"?

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

text/x‑r‑doc is a MIME type for files that hold R documentation content. These files contain structured text, using markup similar to LaTeX, to describe functions, packages, and datasets in the R environment.

This format is designed to interface with R’s built‑in help system.
It lets developers write documentation in a structured, consistent way.
The files are processed to create clear, accessible help pages and manuals.
It standardizes the way R documentation is written for both developers and users.

Typically, these files have the extension RD. For more information on related file types or R documentation, visit the R Project website.

Associated file extensions

.rd

Usage Examples

HTTP Header

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


    Content-Type: text/x-r-doc

HTML

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


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

Associated file extensions

.rd

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.