--- a/src/kaigo/horori/searcher/server/searcher.go	Fri Dec 25 20:48:01 2020 +0900
+++ b/src/kaigo/horori/searcher/server/searcher.go	Fri May 20 06:30:34 2022 +0900
@@ -1,5 +1,5 @@
  /*
-  Last Change: 2020-06-23 火 15:48:49.
+  Last Change: 2022-05-16 月 09:34:18.
  */
 
 package main
@@ -11,7 +11,6 @@
 	"encoding/csv"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
@@ -101,7 +100,7 @@
 	http.HandleFunc("/ha/", hhsdb_handler)   // Get /ha/ -> hhsdb.csv for Mover
 	http.HandleFunc("/i/",  image_handler)   // Get /i/20200110/0800012345.tgz
 	http.HandleFunc("/r/",  recent_handler)  // Get /r/0800012345:0800067890:0800099999:... -> 0800012345,name1,20200101:0800067890,name2,20210405:...
-	http.HandleFunc("/d/",  index_handler)   // Get /d/20xx -> 20xx0401:20xx0408:... , /d/20xx0401 -> 0800012345:0800098765:...
+	http.HandleFunc("/d/",  index_handler)   // Get /d/ -> index.csv, /d/20xx -> 20xx0401:20xx0408:... , /d/20xx0401 -> 0800012345:0800098765:...
 	http.HandleFunc("/dt/", indextm_handler) // Get /dt/ -> 2020-03-14 12:34 (2020-04-02)
 	http.HandleFunc("/hd/", hhsdbidx_handler)// Get /hd/ -> 20010401,0800012345,name1\n20010401,0300011111,name2\n...
 	http.HandleFunc("/ud/", upidx_handler)   // Get /ud/20200402
@@ -119,7 +118,7 @@
 	iymdhash = make(map[string]string)
 	iyhash = make(map[string]string)
 
-	b, err := ioutil.ReadFile(hhsdb)
+	b, err := os.ReadFile(hhsdb)
 	if err != nil {
 		return err
 	}
@@ -140,7 +139,7 @@
 		hhash[record[0]] = h
 	}
 
-	b, err = ioutil.ReadFile(indexdb)
+	b, err = os.ReadFile(indexdb)
 	if err != nil {
 		return err
 	}
@@ -232,7 +231,7 @@
 
 /* Get /ha/ -> hhsdb.csv for Mover */
 func hhsdb_handler(w http.ResponseWriter, r *http.Request) {
-	b, _ := ioutil.ReadFile(hhsdb)
+	b, _ := os.ReadFile(hhsdb)
 	w.Write(b)
 }
 
@@ -273,14 +272,20 @@
 	w.Write([]byte(strings.Join(buf, ":")))
 }
 
-/* Get /d/20xx -> 20xx0401:20xx0408:... , /d/20xx0401 -> 0800012345:0800098765:... */
+/* Get /d/ -> index.csv, /d/20xx -> 20xx0401:20xx0408:... , /d/20xx0401 -> 0800012345:0800098765:... */
 func index_handler(w http.ResponseWriter, r *http.Request) {
+	ymd := r.URL.Path[len("/d/"):]
+
+	if len(ymd) == 0 {
+		b, _ := os.ReadFile(indexdb)
+		w.Write(b)
+		return
+	}
+
 	var buf string
-	ymd := r.URL.Path[len("/d/"):]
 	if len(ymd) == 4 {
 		buf = iyhash[ymd]
-	}
-	if len(ymd) == 8 {
+	} else if len(ymd) == 8 {
 		buf = iymdhash[ymd]
 	}
 	w.Write([]byte(buf[1:]))
@@ -302,7 +307,7 @@
 	}
 	defer f.Close()
 
-    b, err := ioutil.ReadAll(r.Body)
+    b, err := io.ReadAll(r.Body)
     r.Body.Close()
 	if err != nil {
 		write_errlog(12, "cannot read req-body")
@@ -392,7 +397,7 @@
 /* Get /hd/ -> 20010401,0800012345,name1\n20010401,0300011111,name2\n... */
 func hhsdbidx_handler(w http.ResponseWriter, r *http.Request) {
 	s := ""
-	b, err := ioutil.ReadFile(indexdb)
+	b, err := os.ReadFile(indexdb)
 	if err != nil {
 		return
 	}
@@ -426,7 +431,7 @@
 	f.Close()
 
 	imgdir := filepath.Join(server_root, "images", date)
-	files, _ := ioutil.ReadDir(imgdir)
+	files, _ := os.ReadDir(imgdir)
 	for _, file := range files {
 		i := file.Name()[0:10] + "," + date
 		buf = append(buf, i)
@@ -436,7 +441,7 @@
 	os.Remove(indexdb)
 
 	s := strings.Join(buf, "\n")
-	ioutil.WriteFile(indexdb, []byte(s), 0644)
+	os.WriteFile(indexdb, []byte(s), 0644)
 
 	loadDB();
 	w.Write([]byte("update index done."))
@@ -451,7 +456,7 @@
 
 /* Get /pw/ -> id1:pw1:id2:pw2:... */
 func pw_handler(w http.ResponseWriter, r *http.Request) {
-    b, err := ioutil.ReadFile(pwdb)
+    b, err := os.ReadFile(pwdb)
 	if err != nil {
 		write_errlog(30, "cannot read passwd-file")
 		http.NotFound(w, r)