Address the comment

Signed-off-by: JmPotato <ghzpotato@gmail.com>

client/http/client.go

@@ -52,6 +52,9 @@ type Client interface {
 	GetHistoryHotRegions(context.Context, *HistoryHotRegionsRequest) (*HistoryHotRegions, error)
 	GetRegionStatusByKeyRange(context.Context, *KeyRange) (*RegionStats, error)
 	GetStores(context.Context) (*StoresInfo, error)
+	/* Config-related interfaces */
+	GetScheduleConfig(context.Context) (map[string]interface{}, error)
+	SetScheduleConfig(context.Context, map[string]interface{}) error
 	/* Rule-related interfaces */
 	GetAllPlacementRuleBundles(context.Context) ([]*GroupBundle, error)
 	GetPlacementRuleBundleByGroup(context.Context, string) (*GroupBundle, error)
@@ -196,9 +199,9 @@ func (c *client) execDuration(name string, duration time.Duration) {
 type HeaderOption func(header http.Header)
 
 // WithAllowFollowerHandle sets the header field to allow a PD follower to handle this request.
-func WithAllowFollowerHandle(allow bool) HeaderOption {
+func WithAllowFollowerHandle() HeaderOption {
 	return func(header http.Header) {
-		header.Set("PD-Allow-follower-handle", fmt.Sprintf("%t", allow))
+		header.Set("PD-Allow-follower-handle", "true")
 	}
 }
 
@@ -387,7 +390,7 @@ func (c *client) GetHistoryHotRegions(ctx context.Context, req *HistoryHotRegion
 	err = c.requestWithRetry(ctx,
 		"GetHistoryHotRegions", HotHistory,
 		http.MethodGet, bytes.NewBuffer(reqJSON), &historyHotRegions,
-		WithAllowFollowerHandle(true))
+		WithAllowFollowerHandle())
 	if err != nil {
 		return nil, err
 	}
@@ -408,6 +411,29 @@ func (c *client) GetRegionStatusByKeyRange(ctx context.Context, keyRange *KeyRan
 	return &regionStats, nil
 }
 
+// GetScheduleConfig gets the schedule configurations.
+func (c *client) GetScheduleConfig(ctx context.Context) (map[string]interface{}, error) {
+	var config map[string]interface{}
+	err := c.requestWithRetry(ctx,
+		"GetScheduleConfig", ScheduleConfig,
+		http.MethodGet, http.NoBody, &config)
+	if err != nil {
+		return nil, err
+	}
+	return config, nil
+}
+
+// SetScheduleConfig sets the schedule configurations.
+func (c *client) SetScheduleConfig(ctx context.Context, config map[string]interface{}) error {
+	configJSON, err := json.Marshal(config)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	return c.requestWithRetry(ctx,
+		"SetScheduleConfig", ScheduleConfig,
+		http.MethodPost, bytes.NewBuffer(configJSON), nil)
+}
+
 // GetStores gets the stores info.
 func (c *client) GetStores(ctx context.Context) (*StoresInfo, error) {
 	var stores StoresInfo