mirror of
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49 lines
1.4 KiB
Go
49 lines
1.4 KiB
Go
// Copyright 2023 Harness, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package nocache
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import (
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"net/http"
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"time"
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)
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// Ported from Chi's middleware, source:
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// https://github.com/go-chi/chi/blob/v5.0.12/middleware/nocache.go
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// Modified the middleware to retain ETags.
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var epoch = time.Unix(0, 0).Format(time.RFC1123)
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var noCacheHeaders = map[string]string{
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"Expires": epoch,
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"Cache-Control": "no-cache, no-store, no-transform, must-revalidate, private, max-age=0",
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"Pragma": "no-cache",
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"X-Accel-Expires": "0",
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}
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// NoCache is same as chi's default NoCache middleware except it doesn't remove etag headers.
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func NoCache(h http.Handler) http.Handler {
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fn := func(w http.ResponseWriter, r *http.Request) {
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// Set our NoCache headers
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for k, v := range noCacheHeaders {
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w.Header().Set(k, v)
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}
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h.ServeHTTP(w, r)
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}
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return http.HandlerFunc(fn)
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}
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