diff --git a/main.go b/main.go
index 7ddda44..a4145cc 100755
--- a/main.go
+++ b/main.go
@@ -208,46 +208,53 @@ func setContentTypeIfMedia(w http.ResponseWriter, r *http.Request) {
 	if i := strings.LastIndex(ext, "."); i != -1 {
 		ext = ext[i:]
 	}
+	k := "Content-Type"
+	v := ""
 	switch ext {
 	case ".mp4":
-		w.Header().Set("Content-Type", "video/mp4")
+		v = "video/mp4"
 	case ".mkv":
-		w.Header().Set("Content-Type", "video/x-matroska")
+		v = "video/x-matroska"
 	case ".mp3":
-		w.Header().Set("Content-Type", "audio/mpeg3")
+		v = "audio/mpeg3"
 	case ".epub", ".mobi":
-		w.Header().Set("Content-Disposition", "attachment")
+		k = "Content-Disposition"
+		v = "attachment"
 	case ".jpg", ".jpeg":
-		w.Header().Set("Content-Type", "image/jpeg")
+		v = "image/jpeg"
 	case ".gif":
-		w.Header().Set("Content-Type", "image/gif")
+		v = "image/gif"
 	case ".png":
-		w.Header().Set("Content-Type", "image/png")
+		v = "image/png"
 	case ".ico":
-		w.Header().Set("Content-Type", "image/x-icon")
+		v = "image/x-icon"
 	case ".svg":
-		w.Header().Set("Content-Type", "image/svg+xml")
+		v = "image/svg+xml"
 	case ".css":
-		w.Header().Set("Content-Type", "text/css")
+		v = "text/css"
 	case ".js":
-		w.Header().Set("Content-Type", "text/javascript")
+		v = "text/javascript"
 	case ".json":
-		w.Header().Set("Content-Type", "application/json")
+		v = "application/json"
 	case ".html", ".htm":
-		w.Header().Set("Content-Type", "text/html")
+		v = "text/html"
 	case ".pdf":
-		w.Header().Set("Content-Type", "application/pdf")
+		w.Header().Set("Content-Disposition", fmt.Sprintf("inline; filename=%q", path.Base(r.URL.Path)))
+		v = "application/pdf"
 	case ".webm":
-		w.Header().Set("Content-Type", "video/webm")
+		v = "video/webm"
 	case ".weba":
-		w.Header().Set("Content-Type", "audio/webm")
+		v = "audio/webm"
 	case ".webp":
-		w.Header().Set("Content-Type", "image/webp")
+		v = "image/webp"
 	case ".zip":
-		w.Header().Set("Content-Type", "application/zip")
+		v = "application/zip"
 	case ".7z":
-		w.Header().Set("Content-Type", "application/x-7z-compressed")
+		v = "application/x-7z-compressed"
 	case ".tar":
-		w.Header().Set("Content-Type", "application/x-tar")
+		v = "application/x-tar"
+	default:
+		return
 	}
+	w.Header().Set(k, v)
 }