Stone.js API
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    A signed upload target: the URL to PUT to, the method, and any headers the client must send for the signature to match (e.g. Content-Type).

    interface SignedUpload {
        expiresIn: number;
        headers: Record<string, string>;
        method: string;
        url: string;
    }
    Index
    expiresIn: number

    Seconds until the URL expires.

    headers: Record<string, string>

    Headers the client MUST send so the signature validates.

    method: string

    The HTTP method to use (usually PUT).

    url: string

    The signed URL to upload to.