diff --git a/web/server.go b/web/server.go
index 41b8e16..4f381c6 100644
--- a/web/server.go
+++ b/web/server.go
@@ -12,8 +12,8 @@ import (
 	"encoding/json"
 	"encoding/pem"
 	"fmt"
+	"io"
 	"io/fs"
-	"io/ioutil"
 	"log"
 	"log/slog"
 	"math/big"
@@ -1815,27 +1815,33 @@ func (s *Server) handleRerunHeat() http.HandlerFunc {
 	}
 }
 
+func parseRequestBody(r *http.Request) (string, error) {
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		return "", err
+	}
+	return string(body), nil
+}
+
 // handleSetRacingGroup sets the currently racing group
 func (s *Server) handleSetRacingGroup() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		body, err := ioutil.ReadAll(r.Body)
+		text, err := parseRequestBody(r)
 		if err != nil {
-			http.Error(w, "Failed to read request body", http.StatusBadRequest)
+			s.logger.Error("Failed to parse request body", "error", err)
+			http.Error(w, "Failed to parse request body", http.StatusBadRequest)
 			return
 		}
-		defer r.Body.Close()
-
-		// Process the plain text body
-		text := string(body)
 		s.logger.Info("Set racing group request", "text", text)
 
 		// Parse request body
 		var request struct {
 			GroupID int64 `json:"group_id"`
 		}
-
-		if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
-			http.Error(w, "Invalid request body", http.StatusBadRequest)
+		request.GroupID, err = strconv.ParseInt(strings.Split(text, "=")[1], 10, 64)
+		if err != nil {
+			s.logger.Error("Failed to parse group ID", "error", err)
+			http.Error(w, "Failed to parse group ID", http.StatusBadRequest)
 			return
 		}