lookup> multipart/related

multipart/related

multipart/related is a multipart media type.

multipartContent-Type

Quick facts

MIME typemultipart/related

Extensions—

Charset—

CompressibleNo

Sourceiana

What is multipart/related

multipart/related

multipart/related is one of the multipart media types used on the internet. When serving this content over HTTP, set the Content-Type header in the response, for example:

Content-Type: multipart/related

Relation chain

…served as

mime type

multipart/relatedsent via header

http header

Content-Type

Related MIME types

multipart/alternative multipart/appledouble multipart/byteranges multipart/digest

Used with

multipart/related is identified in HTTP by the Content-Type header and is commonly used with these methods:

Related headers

Related methods

Frequently asked questions

What is multipart/related?

multipart/related is a multipart media type used to identify a content format; servers announce it to clients with the Content-Type header.

Which file extensions use multipart/related?

Extensions such as none registered are associated with this MIME type.

How do I set the Content-Type for multipart/related?

Send Content-Type: multipart/related in the HTTP response.

Sources & standards

Updated 2026-08-18

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