You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: content_encoding.go
    path of file: ./repos/corteza/server/vendor/github.com/go-chi/chi/v5/middleware
    
    the code of the file until where you have to start completion: package middleware

import (
	"net/http"
	"strings"
)

// AllowContentEncoding enforces a whitelist of request Content-Encoding otherwise responds
// with a 415 
    
func AllowContentEncoding(contentEncoding ...string) func(next http.Handler) http.Handler {
	allowedEncodings := make(map[string]struct{}, len(contentEncoding))
	for _, encoding := range contentEncoding {
		allowedEncodings[strings.TrimSpace(strings.ToLower(encoding))] = struct{}{}
	}
	return func(next http.Handler) http.Handler {
		fn := func(w http.ResponseWriter, r *http.Request) {
			requestEncodings := r.Header["Content-Encoding"]
			// skip check for empty content body or no Content-Encoding
			if r.ContentLength == 0 {
				next.ServeHTTP(w, r)
				return
			}
			// All encodings in the request must be allowed
			for _, encoding := range requestEncodings {
				if _, ok := allowedEncodings[strings.TrimSpace(strings.ToLower(encoding))]; !ok {
					w.WriteHeader(http.StatusUnsupportedMediaType)
					return
				}
			}
			next.ServeHTTP(w, r)
		}
		return http.HandlerFunc(fn)
	}
}