MultipartText-based

`multipart/related`

HTTP Content-Type Header

HTTP Header

Content-Type: multipart/related; charset=utf-8

Quick Facts

MIME Type	multipart/related
Category	Multipart
Type	Text-based (human-readable)

Common Usage

multipart/related bundles a root document with resources it references (images, stylesheets). The primary use is HTML email with inline images — the HTML body references embedded images by Content-ID.

Also used in SOAP messages with attachments and MHTML web archives.

Code Examples

HTML

<!-- Set MIME type in meta or fetch headers -->
<meta http-equiv="Content-Type" content="multipart/related">

Node.js

// Express.js
app.get('/file', (req, res) => {
  res.type('multipart/related');
  res.send(data);
});

// Node.js http
res.writeHead(200, { 'Content-Type': 'multipart/related' });

nginx

# nginx.conf — add to types block or use default
types {
    multipart/related  related;
}

# Or set for a specific location
location /api/ {
    default_type multipart/related;
}