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

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

application/x-nzb is a MIME type for NZB files.
These files are in an XML format. They list pointers to file parts hosted on Usenet servers.
A newsreader uses this data to download the necessary pieces automatically.

Automation: NZB files streamline the download process by organizing file segments.
Usenet Integration: They are designed to work with clients that access Usenet newsgroups.
Structured Data: The XML format efficiently conveys metadata and message IDs.

This MIME type functions similarly to how a torrent file directs downloads from peer-to-peer networks but is specific to Usenet.
For more details on Usenet, visit Wikipedia.

Associated file extensions

.nzb

Usage Examples

HTTP Header

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


    Content-Type: application/x-nzb

HTML

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


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

Associated file extensions

.nzb

FAQs

What is the purpose of the application/x-nzb MIME type?

The application/x-nzb type identifies NZB files, which are XML documents used to automate binary downloads from Usenet. Similar to a torrent file, it contains metadata and pointers (Message-IDs) that tell a newsreader client exactly which parts of a file to download and assemble.

How do I configure Apache to serve NZB files correctly?

To ensure browsers download the file or open it in a newsreader rather than displaying XML text, map the extension in your .htaccess or server config. Add the line: AddType application/x-nzb .nzb.

Why does my browser display XML code instead of opening the NZB file?

Because NZB files utilize XML structure, servers often default to sending them as text/xml or text/plain. You must configure the server to send the specific application/x-nzb header so the browser knows to hand the file over to an external application like SABnzbd or NZBGet.

How do I add support for application/x-nzb in Nginx?

You can register the MIME type in your nginx.conf file or mime.types file. Inside the types block, include the directive: application/x-nzb nzb;, then reload the Nginx service.

Is application/x-nzb a standard IANA type?

No, the x- prefix indicates that it is a non-standard or proprietary extension. While not officially registered with IANA, it is the de facto standard used by all Usenet indexers and clients to identify .nzb files.

Are there security risks associated with this MIME type?

The NZB file itself is harmless text, but it instructs software to download binary content from the internet. Users should ensure they trust the source of the application/x-nzb file, as the resulting downloaded content could contain malware or viruses.

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.