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

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-reasonml indicates that the file contains ReasonML code. It signals to editors and compilers that the content follows a syntax developed for this language. Use of this MIME type helps programs choose the right rules for code formatting and error checking.

ReasonML is a syntax and toolchain that builds on OCaml. It targets functional programming and modern web development. Files using this type usually come in the formats RE and REI.

Code Editing: Editors use this type for syntax highlighting and immediate error detection.
Compilation: Build systems identify the format to properly compile and execute the code.
Tool Integration: It assists plugins and development tools in applying the correct rules for formatting and testing.

For more details on ReasonML and its applications, visit the official ReasonML website.

Associated file extensions

.re, .rei

Usage Examples

HTTP Header

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


    Content-Type: text/x-reasonml

HTML

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


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

Associated file extensions

.re, .rei

FAQs

Which file extensions are associated with text/x-reasonml?

The MIME type text/x-reasonml is strictly associated with ReasonML source code. The most common extensions are .re for implementation files and .rei for interface files.

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

No, web browsers do not understand ReasonML natively. To run this code in a browser, it must first be compiled into standard JavaScript using a toolchain like BuckleScript or ReScript.

How do I configure Nginx to serve ReasonML files correctly?

To serve these files with the correct Content-Type, add the definition to your mime.types file or inside a server block. Use the directive: text/x-reasonml re rei;.

What does the "x-" prefix signify in this MIME type?

The x- prefix indicates that text/x-reasonml is a non-standard or experimental type not centrally registered with the IANA. It is conventionally used for specific programming languages to prevent conflicts with standard text types.

How do I add support for text/x-reasonml in Apache?

You can map the MIME type in your .htaccess file or the main Apache configuration. Add the following line: AddType text/x-reasonml .re .rei.

Why is this MIME type important for code editors?

Editors use text/x-reasonml to distinguish ReasonML syntax from standard OCaml or JavaScript. This allows IDEs (like VS Code with Reason plugins) to apply the correct syntax highlighting, linting, and auto-formatting rules.

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.