---
title: "104 Upload Resumption Supported — what it means and how to fix it"
description: "A provisional code signalling that the server supports resumable uploads. What causes an HTTP 104, what to try as a visitor, and what to check if it is your own site."
url: https://atoneplace.net/error/104/
site: "At One Place"
---

# HTTP 104 — Upload Resumption Supported

**HTTP 104: Upload Resumption Supported**

A provisional code signalling that the server supports resumable uploads.

## What 104 actually means

This is a temporary registration attached to an unfinished IETF draft on resumable uploads, not a finished standard. The idea is that a server can answer the start of an upload with a 104 plus a location the client can use to resume from if the connection drops. Treat it as experimental: the number and the semantics can still change before the draft becomes an RFC.

## Common causes

- A client and server are negotiating the draft resumable-uploads protocol
- An upload service implementing the IETF draft ahead of standardisation

## If you're just trying to view the page

1. Nothing — this is protocol negotiation and never surfaces as a page
2. If an upload tool reports it as an error, the tool is mishandling an interim response; check for an update

## If it's your site

1. Do not depend on 104 in production; the draft is not final and the code is a provisional registration
2. Use the well-established alternatives — tus, or S3 multipart uploads — for resumable uploads you need to ship today

## Reference

- **Status code:** 104
- **Reason phrase:** Upload Resumption Supported
- **Category:** 1xx — Informational
- **Defined in:** draft-ietf-httpbis-resumable-upload (temporary registration)

## Common questions

### What does HTTP 104 mean?

A provisional code signalling that the server supports resumable uploads. This is a temporary registration attached to an unfinished IETF draft on resumable uploads, not a finished standard. The idea is that a server can answer the start of an upload with a 104 plus a location the client can use to resume from if the connection drops.

### How do I fix a 104 error?

Nothing — this is protocol negotiation and never surfaces as a page

### Is 104 a client error or a server error?

104 is in the 1xx range, which means informational. It is not an error at all.

## Related pages

- [101 Switching Protocols](https://atoneplace.net/error/101/)
- [103 Early Hints](https://atoneplace.net/error/103/)
- [100 Continue](https://atoneplace.net/error/100/)
- [102 Processing](https://atoneplace.net/error/102/)

## Sources

- Hypertext Transfer Protocol (HTTP) Status Code Registry — IANA (https://www.iana.org/assignments/http-status-codes/)
- RFC 9110: HTTP Semantics — IETF (https://www.rfc-editor.org/rfc/rfc9110.html)