add Request URI and response body to debugging output

Author: lcowell

api/client.go

@@ -1,13 +1,15 @@
 package api
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
 	"strings"
 
 	"github.com/exercism/cli/config"
+	"github.com/exercism/cli/debug"
 )
 
 const (
@@ -45,6 +47,7 @@ func (c *Client) NewRequest(method, url string, body io.Reader) (*http.Request,
 	if err != nil {
 		return nil, err
 	}
+	debug.Println("NewRequest:", method, url)
 
 	req.Header.Set("User-Agent", UserAgent)
 	req.Header.Set("Content-Type", "application/json")
@@ -71,7 +74,12 @@ func (c *Client) Do(req *http.Request, v interface{}) (*http.Response, error) {
 	default:
 		if v != nil {
 			defer res.Body.Close()
-			if err := json.NewDecoder(res.Body).Decode(v); err != nil {
+
+			var bodyCopy bytes.Buffer
+			body := io.TeeReader(res.Body, &bodyCopy)
+
+			if err := json.NewDecoder(body).Decode(v); err != nil {
+				debug.Println("res.Body:", bodyCopy.String())
 				return nil, fmt.Errorf("error parsing API response - %s", err)
 			}
 		}