diff --git a/browse/browse.go b/browse/browse.go
index 8527d6c5..1463b22b 100644
--- a/browse/browse.go
+++ b/browse/browse.go
@@ -1,6 +1,7 @@
 package browse
 
 import (
+	"errors"
 	"net/http"
 	"strings"
 
@@ -21,6 +22,6 @@ func ServeHTTP(w http.ResponseWriter, r *http.Request, c *config.Config) (int, e
 	case "GET":
 		return GET(w, r, c)
 	default:
-		return 400, nil
+		return 400, errors.New("Invalid method.")
 	}
 }
diff --git a/editor/editor.go b/editor/editor.go
index 40ad2e61..03c958df 100644
--- a/editor/editor.go
+++ b/editor/editor.go
@@ -1,6 +1,7 @@
 package editor
 
 import (
+	"errors"
 	"net/http"
 	"strings"
 
@@ -18,6 +19,6 @@ func ServeHTTP(w http.ResponseWriter, r *http.Request, c *config.Config) (int, e
 	case "GET":
 		return GET(w, r, c, filename)
 	default:
-		return 400, nil
+		return 400, errors.New("Invalid method.")
 	}
 }
diff --git a/editor/post.go b/editor/post.go
index 83c0590c..5d8b2967 100644
--- a/editor/post.go
+++ b/editor/post.go
@@ -81,7 +81,7 @@ func parseFrontMatterOnlyFile(rawFile map[string]interface{}, filename string) (
 	case "yaml":
 		mark = rune('-')
 	default:
-		return []byte{}, http.StatusBadRequest, errors.New("can't define the frontmatter")
+		return []byte{}, http.StatusBadRequest, errors.New("Can't define the frontmatter.")
 	}
 
 	f, err := parser.InterfaceToFrontMatter(rawFile, mark)