Rewrite: Use only `fragment`, remove `frag`.

middleware/replacer.go

@@ -41,7 +41,6 @@ func NewReplacer(r *http.Request, rr *responseRecorder, emptyValue string) Repla
 			"{host}":     r.Host,
 			"{path}":     r.URL.Path,
 			"{query}":    r.URL.RawQuery,
-			"{frag}":     r.URL.Fragment,
 			"{fragment}": r.URL.Fragment,
 			"{proto}":    r.Proto,
 			"{remote}": func() string {

middleware/rewrite/rewrite_test.go

@@ -28,7 +28,7 @@ func TestRewrite(t *testing.T) {
 		[]string{"/ab/", "ab", "/ab?type=html&{query}", ".html|"},
 		[]string{"/abc/", "ab", "/abc/{file}", ".html|"},
 		[]string{"/abcd/", "ab", "/a/{dir}/{file}", ".html|"},
-		[]string{"/abcde/", "ab", "/a#{frag}", ".html|"},
+		[]string{"/abcde/", "ab", "/a#{fragment}", ".html|"},
 		[]string{"/ab/", `.*\.jpg`, "/ajpg", ""},
 	}