---
title: Expo Structured Field Values
sidebar_title: Expo Structured Field Values
---

Version 0

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Structured Field Values for HTTP, [IETF RFC 8941](https://tools.ietf.org/html/rfc8941), is a proposal to formalize header syntax and facilitate nested data.

Since it is still a work in progress, Expo maintains a custom version that only implements the following subset of the protocol defined in [IETF RFC 8941](https://tools.ietf.org/html/rfc8941):
  * All key values
  * String, integer, and decimal items
  * Dictionaries

---
title: Expo Structured Field Values
sidebar_title: Expo Structured Field Values
---

Version 0

Updated 2021-05-24

---

Structured Field Values for HTTP, [IETF RFC 8941](https://tools.ietf.org/html/rfc8941), is a proposal to formalize header syntax and facilitate nested data.

Since it is still a work in progress, Expo maintains a custom version that only implements the following subset of the protocol defined in [IETF RFC 8941](https://tools.ietf.org/html/rfc8941):
  * All key values
  * String, integer, and decimal items
  * Dictionaries

Add date to Expo SFV docs
[docs] Add date to Expo SFV docs

This provides some more context about the how recently the spec was updated.