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annotate pkg/middleware/notfound.go @ 1127:71ba4a66ec95

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Return 404 if a proxied service is not found.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 07 Nov 2018 16:08:25 +0100
parents
children 04967d6565fa
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1127
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package middleware
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15
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16 import (
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17 "errors"
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18 "net/http"
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19 )
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20
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21 var ErrNotFound = errors.New("Not found")
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22
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23 func NotFound(next http.Handler) http.Handler {
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24 return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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25 defer func() {
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26 if p := recover(); p != nil {
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27 if p == ErrNotFound {
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28 http.NotFound(rw, req)
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29 } else {
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30 panic(p)
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31 }
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32 }
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33 }()
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34 next.ServeHTTP(rw, req)
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35 })
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36 }