Minor corrections to error handling logic in httpu.

httpu/httpu.go

@@ -91,14 +91,18 @@ func (httpu *HTTPUClient) Do(req *http.Request, timeout time.Duration, numSends
 		// 2048 bytes should be sufficient for most networks.
 		n, _, err := httpu.conn.ReadFrom(responseBytes)
 		if err != nil {
-			if err, ok := err.(net.Error); ok && err.Timeout() {
+			if err, ok := err.(net.Error); ok {
+				if err.Timeout() {
 					break
 				}
-			log.Print("httpu: error while receiving response: %v", err)
+				if err.Temporary() {
 					// Sleep in case this is a persistent error to avoid pegging CPU until deadline.
 					time.Sleep(10 * time.Millisecond)
 					continue
 				}
+			}
+			return nil, err
+		}
 
 		// Parse response.
 		response, err := http.ReadResponse(bufio.NewReader(bytes.NewBuffer(responseBytes[:n])), req)