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Range request example is off-by-one #28030

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#28031
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Range request example is off-by-one#28030
#28031
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docsImprovements or additions to documentation
@DavidBuchanan314

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@DavidBuchanan314
DavidBuchanan314
opened on Mar 12, 2026

What is the type of issue?

Example code is not working

What is the issue?

bun/docs/runtime/http/routing.mdx

Lines 219 to 233 in a305e99

Bun.serve({
fetch(req) {
// parse `Range` header
const [start = 0, end = Infinity] = req.headers
.get("Range") // Range: bytes=0-100
.split("=") // ["Range: bytes", "0-100"]
.at(-1) // "0-100"
.split("-") // ["0", "100"]
.map(Number); // [0, 100]
// return a slice of the file
const bigFile = Bun.file("./big-video.mp4");
return new Response(bigFile.slice(start, end));
},
});

The HTTP range header is end-inclusive, so the last line should probably use end + 1 to be correct. I think the ["Range: bytes", "0-100"] comment is likely misleading too, presumably it's supposed to be ["bytes", "0-100"].

Where did you find it?

https://bun.com/docs/runtime/http/routing

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