use go 1.12

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

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

@@ -0,0 +1,73 @@
+// 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 status is middleware for returning status code for requests
+package status
+
+import (
+	"net/http"
+
+	"github.com/mholt/caddy/caddyhttp/httpserver"
+)
+
+// Rule describes status rewriting rule
+type Rule struct {
+	// Base path. Request to this path and sub-paths will be answered with StatusCode
+	Base string
+
+	// Status code to return
+	StatusCode int
+
+	// Request matcher
+	httpserver.RequestMatcher
+}
+
+// NewRule creates new Rule.
+func NewRule(basePath string, status int) *Rule {
+	return &Rule{
+		Base:           basePath,
+		StatusCode:     status,
+		RequestMatcher: httpserver.PathMatcher(basePath),
+	}
+}
+
+// BasePath implements httpserver.HandlerConfig interface
+func (rule *Rule) BasePath() string {
+	return rule.Base
+}
+
+// Status is a middleware to return status code for request
+type Status struct {
+	Rules []httpserver.HandlerConfig
+	Next  httpserver.Handler
+}
+
+// ServeHTTP implements the httpserver.Handler interface
+func (status Status) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
+	if cfg := httpserver.ConfigSelector(status.Rules).Select(r); cfg != nil {
+		rule := cfg.(*Rule)
+
+		if rule.StatusCode < 400 {
+			// There's no ability to return response body --
+			// write the response status code in header and signal
+			// to other handlers that response is already handled
+			w.WriteHeader(rule.StatusCode)
+			return 0, nil
+		}
+
+		return rule.StatusCode, nil
+	}
+
+	return status.Next.ServeHTTP(w, r)
+}