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fetching files renders invalid blob · Issue #145 · developit/unfetch · GitHub

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fetching files renders invalid blob #145

Description

How it should be

let e = await fetch('https://i.imgur.com/4AiXzf8.jpg')
// Response { type: "cors", url: "https://i.imgur.com/4AiXzf8.jpg", redirected: false, status: 200, ok: true, statusText: "OK", headers: // Headers, body: ReadableStream, bodyUsed: false }
await e.blob()
// Blob { size: 87363, type: "image/jpeg" }

How it is with unfetch

let e = await fetch('https://i.imgur.com/4AiXzf8.jpg')
// Object { ok: true, statusText: "OK", status: 200, url: "https://i.imgur.com/4AiXzf8.jpg", text: text(), json: json(), blob: blob(), clone: a(), headers: {…} }
await e.blob()
// Blob { size: 156997, type: "" }

Note how the blob's size is different and the type is missing.

That can also be confirmed by using FileReader.readAsDataURL() on the generated blob, the resulting file is invalid and cannot be opened.

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