Retry when getting an EOF on HEAD/GET requests because of a Golang bug

Author: lebauce

swift.go

@@ -465,6 +465,15 @@ func (c *Connection) Call(targetUrl string, p RequestOpts) (resp *http.Response,
 		req.Header.Add("X-Auth-Token", authToken)
 		resp, err = c.doTimeoutRequest(timer, req)
 		if err != nil {
+			// Because of https://github.com/golang/go/issues/4677,
+			// we sometimes get an url.Error error embedding an io.EOF error.
+			// In that case, we simply retry to send the request
+			if urlError, ok := err.(*url.Error); ok {
+				if urlError.Err == io.EOF && (p.Operation == "HEAD" || p.Operation == "GET") {
+					retries--;
+					continue
+				}
+			}
 			return
 		}
 		// Check to see if token has expired