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middleware.go
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middleware.go
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// 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.
//go:build !js
// +build !js
package server
import (
"io"
"net/http"
"github.com/go-chi/chi/v5"
)
// GetHead automatically route undefined HEAD requests to GET handlers, and
// discards the response body for such requests.
//
// Forked from chi middleware package.
func GetHead(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Method == "HEAD" {
rctx := chi.RouteContext(r.Context())
routePath := rctx.RoutePath
if routePath == "" {
if r.URL.RawPath != "" {
routePath = r.URL.RawPath
} else {
routePath = r.URL.Path
}
}
// Temporary routing context to look-ahead before routing the request
tctx := chi.NewRouteContext()
// Attempt to find a HEAD handler for the routing path, if not found, traverse
// the router as through its a GET route, but proceed with the request
// with the HEAD method.
if !rctx.Routes.Match(tctx, "HEAD", routePath) {
type httpWriter interface { // Just the methods unique to http.ResponseWriter
Header() http.Header
WriteHeader(statusCode int)
}
discardWriter := struct {
httpWriter
io.Writer
}{
httpWriter: w,
Writer: io.Discard,
}
rctx.RouteMethod = "GET"
rctx.RoutePath = routePath
next.ServeHTTP(discardWriter, r)
return
}
}
next.ServeHTTP(w, r)
})
}