in src/gcs.rs [688:700]
fn landsat_obj_url(object_str: &str) -> Url {
let mut object_url = Url::parse("https://www.googleapis.com/storage/v1/b").unwrap();
// Each *push* url encodeds the argument and then also adds a
// *real* slash *before* appending.
object_url
.path_segments_mut()
.unwrap()
.push(LANDSAT_BUCKET)
.push("o")
.push(object_str);
object_url
}