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).
PUT
Content-Type
Seconds until the URL expires.
Headers the client MUST send so the signature validates.
The HTTP method to use (usually PUT).
The signed URL to upload to.
A signed upload target: the URL to
PUTto, the method, and any headers the client must send for the signature to match (e.g.Content-Type).