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

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

application/x-rocketebook is a MIME type that signals a file is formatted for Rocket eBook software. It tells your system that the file contains structured ebook content intended for display with a dedicated reader.

This type is linked with files typically ending in RB. When an operating system or browser sees this MIME type, it knows to use software that supports this specific format.

Main Use Case:
It directs the file to be opened with an application designed for ebook reading and formatting.

Key Facts:

Ebook Display: Files hold text, images, and layout info specific to ebook presentation.
Conversion Tools: They may be processed or converted by software to other ebook formats.
Legacy Compatibility: Originally used in earlier ebook software systems, it helps in managing older ebook libraries.

The x- prefix shows that this MIME type is not an official standard but is used by specialized or legacy systems. For more details on file types, visit the RB file extension page or check resources like the IANA Media Types listing.

Associated file extensions

.rb

Usage Examples

HTTP Header

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


    Content-Type: application/x-rocketebook

HTML

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


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

Associated file extensions

.rb

FAQs

What is the primary use of application/x-rocketebook?

This MIME type represents the Rocket eBook format, a legacy digital book file structure. It is used to identify files, usually with the .rb extension, intended for the NuvoMedia Rocket eBook reader or compatible software emulators.

Is application/x-rocketebook used for Ruby programming files?

No, this is a common point of confusion because both formats use the .rb extension. Ruby scripts typically use application/x-ruby or text/x-ruby. You must ensure your server sends the correct header to distinguish between an executable script and an ebook binary.

How do I configure Apache to serve Rocket eBook files correctly?

To ensure browsers treat .rb files as ebooks rather than Ruby scripts or text, add the following line to your .htaccess file or server configuration: AddType application/x-rocketebook .rb. This forces the correct MIME association.

Can I convert application/x-rocketebook files to modern formats?

Yes, because this is an older format, it is often necessary to convert it for modern devices. Tools like Calibre can accept application/x-rocketebook input and convert it to modern standards like application/epub+zip or application/x-mobipocket-ebook.

Why does this MIME type start with x-?

The x- prefix indicates that application/x-rocketebook is a non-standard or experimental type not officially registered in the main IANA tree. It was defined by the software vendor (NuvoMedia) for their specific hardware ecosystem.

Do web browsers display this file type natively?

No, modern web browsers (Chrome, Firefox, Edge) do not have built-in rendering engines for Rocket eBooks. If a server sends this MIME type, the browser will typically trigger a file download dialog rather than displaying the content.

How do I add support for this MIME type in Nginx?

Open your mime.types file (usually located in /etc/nginx/) and add the entry application/x-rocketebook rb;. After saving the file, reload Nginx to apply the changes so the server correctly identifies the file type.

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.