use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/mholt/caddy/caddyhttp/proxy/setup.go

@@ -0,0 +1,45 @@
+// Copyright 2015 Light Code Labs, LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package proxy
+
+import (
+	"github.com/mholt/caddy"
+	"github.com/mholt/caddy/caddyhttp/httpserver"
+)
+
+func init() {
+	caddy.RegisterPlugin("proxy", caddy.Plugin{
+		ServerType: "http",
+		Action:     setup,
+	})
+}
+
+// setup configures a new Proxy middleware instance.
+func setup(c *caddy.Controller) error {
+	upstreams, err := NewStaticUpstreams(c.Dispenser, httpserver.GetConfig(c).Host())
+	if err != nil {
+		return err
+	}
+	httpserver.GetConfig(c).AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
+		return Proxy{Next: next, Upstreams: upstreams}
+	})
+
+	// Register shutdown handlers.
+	for _, upstream := range upstreams {
+		c.OnShutdown(upstream.Stop)
+	}
+
+	return nil
+}