api timeout by client handled properly using net.Timeout() in HttpError

pkg/funcs.go

@@ -3,6 +3,7 @@ package pkg
 import (
 	"encoding/json"
 	"fmt"
+	"net"
 	"net/http"
 	"strings"
 	"time"
@@ -69,7 +70,7 @@ func getBody(url string, m mashup) error {
 func HttpError(w http.ResponseWriter, err error) {
 
 	// if timeout happened
-	if strings.Contains(err.Error(), "Client.Timeout exceeded") {
+	if err, ok:= err.(net.Error); ok && err.Timeout() {
 		http.Error(w, "Request to API timed out", http.StatusGatewayTimeout)
 		return // return if error is already displayed
 	}