Improve logging and error handling

cmd/eksterd/main.go

@@ -21,11 +21,13 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
+	"io"
 	"log"
 	"net/http"
 	"net/url"
 	"os"
 	"regexp"
+	"strings"
 	"time"
 
 	"github.com/garyburd/redigo/redis"
@@ -160,7 +162,21 @@ func (h *mainHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			reqData.Set("code", code)
 			reqData.Set("client_id", sess.ClientID)
 			reqData.Set("redirect_uri", sess.RedirectURI)
-			resp, err := http.PostForm(sess.AuthorizationEndpoint, reqData)
+
+			// resp, err := http.PostForm(sess.AuthorizationEndpoint, reqData)
+			req, err := http.NewRequest(http.MethodPost, sess.AuthorizationEndpoint, strings.NewReader(reqData.Encode()))
+			if err != nil {
+				fmt.Fprintf(w, "ERROR: %q\n", err)
+				return
+			}
+
+			req.Header.Add("Accept", "application/json")
+			req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
+
+			log.Println(req)
+
+			client := http.Client{}
+			resp, err := client.Do(req)
 			if err != nil {
 				fmt.Fprintf(w, "ERROR: %q\n", err)
 				return
@@ -168,7 +184,8 @@ func (h *mainHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			defer resp.Body.Close()
 
 			if resp.StatusCode == 200 {
-				dec := json.NewDecoder(resp.Body)
+				input := io.TeeReader(resp.Body, os.Stderr)
+				dec := json.NewDecoder(input)
 				var authResponse authResponse
 				err = dec.Decode(&authResponse)
 				if err != nil {