diff --git a/cmd/http/main.go b/cmd/http/main.go
index ebc9abf..c1b1d54 100644
--- a/cmd/http/main.go
+++ b/cmd/http/main.go
@@ -96,6 +96,14 @@ func Main() {
 				})
 				return
 			case "/api/lastnlines":
+				if r.Method != http.MethodPut {
+					http.NotFound(w, r)
+					return
+				}
+				var lines []string
+				if err := json.NewDecoder(r.Body).Decode(&lines); err != nil {
+					panic(err)
+				}
 				http.Error(w, "not done yet", http.StatusNotImplemented)
 				return
 			}
diff --git a/cmd/http/public/transactions.html b/cmd/http/public/transactions.html
index 574a125..cccf5b3 100644
--- a/cmd/http/public/transactions.html
+++ b/cmd/http/public/transactions.html
@@ -70,16 +70,15 @@
         document.getElementById("reg").innerHTML = result
       }
       function setLastNLines(form) {
-        console.log(form.elements["lastNLines"].value.split("\n"))
         http("PUT", "/api/lastnlines?f="+f, (body, status) => {
           if (status == 205) {
             init()
           }
           document.getElementById("lastNLinesStatus").innerHTML = `(${status}) ${body}`
-        }, form.elements["lastNLines"].value.split("\n"))
+        }, JSON.stringify(form.elements["lastNLines"].value.split("\n")))
       }
       function loadLastNLines(lastNLines) {
-        var result = `<form onsubmit="setLastNLines(this); return false;">`
+        var result = `<form onsubmit="setLastNLines(this); return false;" action="#">`
         result += `  <textarea name="lastNLines">`
         for (var k in lastNLines) {
           result += lastNLines[k] + "\n"