use go 1.12

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

vendor/github.com/mholt/caddy/caddyhttp/push/push.go

@@ -0,0 +1,46 @@
+// 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 push
+
+import (
+	"net/http"
+
+	"github.com/mholt/caddy/caddyhttp/httpserver"
+)
+
+type (
+	// Rule describes conditions on which resources will be pushed
+	Rule struct {
+		Path      string
+		Resources []Resource
+	}
+
+	// Resource describes resource to be pushed
+	Resource struct {
+		Path   string
+		Method string
+		Header http.Header
+	}
+
+	// Middleware supports pushing resources to clients
+	Middleware struct {
+		Next       httpserver.Handler
+		Rules      []Rule
+		Root       http.FileSystem
+		indexPages []string // will be injected from SiteConfig on setup
+	}
+
+	ruleOp func([]Resource)
+)