// but not the stream-level flow control.
				sc.sendWindowUpdate(nil, int(f.Length)-wrote)
				return nil
			}
			if wrote != len(data) {
				panic("internal error: bad Writer")
			}
		}

		// Return any padded flow control now, since we won't
		// refund it later on body reads.
		// Call sendWindowUpdate even if there is no padding,