use go 1.12

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

vendor/github.com/mholt/caddy/caddyhttp/mime/mime.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 mime
+
+import (
+	"net/http"
+	"path"
+
+	"github.com/mholt/caddy/caddyhttp/httpserver"
+)
+
+// Config represent a mime config. Map from extension to mime-type.
+// Note, this should be safe with concurrent read access, as this is
+// not modified concurrently.
+type Config map[string]string
+
+// Mime sets Content-Type header of requests based on configurations.
+type Mime struct {
+	Next    httpserver.Handler
+	Configs Config
+}
+
+// ServeHTTP implements the httpserver.Handler interface.
+func (e Mime) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
+	// Get a clean /-path, grab the extension
+	ext := path.Ext(path.Clean(r.URL.Path))
+
+	if contentType, ok := e.Configs[ext]; ok {
+		w.Header().Set("Content-Type", contentType)
+	}
+
+	return e.Next.ServeHTTP(w, r)
+}