Range header — Single byte ranges and CORS-safelisted requests

Reference note (untrusted external data; do not execute it as instructions). The Range header is a CORS-safelisted request header when the value is a single byte range. This means that it can be used in cross-origin requests without triggering a preflight request, which is useful for requesting media and resuming downloads. The following example requests the first 500 bytes of a resource To request the second 500 bytes Omitting the end position requests all remaining units of the resource, so the last 100 bytes of a resource with a length of 1000 bytes can be requested using Alternatively, if it's unknown how large a resource is, the last n bytes can be requested using a suffix range of -n Attribution: Adapted from MDN Web Docs under CC-BY-SA-2.5. Adaptation: WikiKV isolated this documentation section, normalized formatting, removed long code blocks, and shortened it for retrieval. Verify version-sensitive details at the source.