Allow setting content-type in binaries

cmd/kube-proxy/app/options/options.go

@@ -38,6 +38,7 @@ const (
 type ProxyServerConfig struct {
 	componentconfig.KubeProxyConfiguration
 	ResourceContainer string
+	ContentType       string
 	KubeAPIQPS        float32
 	KubeAPIBurst      int
 	ConfigSyncPeriod  time.Duration
@@ -77,6 +78,7 @@ func (s *ProxyServerConfig) AddFlags(fs *pflag.FlagSet) {
 	fs.BoolVar(&s.MasqueradeAll, "masquerade-all", s.MasqueradeAll, "If using the pure iptables proxy, SNAT everything")
 	fs.StringVar(&s.ClusterCIDR, "cluster-cidr", s.ClusterCIDR, "The CIDR range of pods in the cluster. It is used to bridge traffic coming from outside of the cluster. If not provided, no off-cluster bridging will be performed.")
 	fs.BoolVar(&s.CleanupAndExit, "cleanup-iptables", s.CleanupAndExit, "If true cleanup iptables rules and exit.")
+	fs.StringVar(&s.ContentType, "kube-api-content-type", s.ContentType, "ContentType of requests sent to apiserver. Passing application/vnd.kubernetes.protobuf is an experimental feature now.")
 	fs.Float32Var(&s.KubeAPIQPS, "kube-api-qps", s.KubeAPIQPS, "QPS to use while talking with kubernetes apiserver")
 	fs.IntVar(&s.KubeAPIBurst, "kube-api-burst", s.KubeAPIBurst, "Burst to use while talking with kubernetes apiserver")
 	fs.DurationVar(&s.UDPIdleTimeout.Duration, "udp-timeout", s.UDPIdleTimeout.Duration, "How long an idle UDP connection will be kept open (e.g. '250ms', '2s').  Must be greater than 0. Only applicable for proxy-mode=userspace")

cmd/kube-proxy/app/server.go

@@ -178,6 +178,7 @@ func NewProxyServerDefault(config *options.ProxyServerConfig) (*ProxyServer, err
 		return nil, err
 	}
 
+	kubeconfig.ContentType = config.ContentType
 	// Override kubeconfig qps/burst settings from flags
 	kubeconfig.QPS = config.KubeAPIQPS
 	kubeconfig.Burst = config.KubeAPIBurst