Accept-Ranges Header

What is the Accept-Ranges header?

The Accept-Ranges response header tells the client whether the server supports partial requests for a resource, and which unit those ranges are measured in. The value bytes signals support, while none explicitly indicates that ranges are not supported.

API Usage & Best Practices

• Enables resumable transfers: When a client sees Accept-Ranges: bytes, it knows it can safely send a Range header to resume a download or stream a portion of the resource.
• Be explicit about no support: Returning Accept-Ranges: none discourages clients from attempting range requests that the server would only answer with the full body.

Examples

HTTP/1.1 200 OK
Content-Length: 146515
Accept-Ranges: bytes