Unmarshal must add & and query should encode (#58)

Author: wangle201210

examples/custom_context/main.go

@@ -56,7 +56,9 @@ func makeRequest(ctx context.Context, message, token string) (*response, error)
 return nil, err
 }
 req.Header.Set("Authorization", token)
-req.URL.Query().Add("message", message)
+query := req.URL.Query()
+query.Add("message", message)
+req.URL.RawQuery = query.Encode()
 resp, err := http.DefaultClient.Do(req)
 if err != nil {
 return nil, err
@@ -67,7 +69,7 @@ func makeRequest(ctx context.Context, message, token string) (*response, error)
 return nil, err
 }
 var r *response
-if err := json.Unmarshal(body, r); err != nil {
+if err := json.Unmarshal(body, &r); err != nil {
 return nil, err
 }
 return r, nil