set correct content type for error messages

src/routes/api/export.js

@@ -15,7 +15,9 @@ function exportBranch(req, res) {
         const message = `Cannot export branch ${branchId} since it does not exist.`;
         log.error(message);
 
-        res.status(500).send(message);
+        res.setHeader("Content-Type", "text/plain")
+            .status(500)
+            .send(message);
         return;
     }
 
@@ -41,7 +43,9 @@ function exportBranch(req, res) {
 
         log.error(message + e.stack);
 
-        res.status(500).send(message);
+        res.setHeader("Content-Type", "text/plain")
+            .status(500)
+            .send(message);
     }
 }
 

src/routes/api/files.js

@@ -48,7 +48,9 @@ function downloadNoteFile(noteId, res, contentDisposition = true) {
     const note = becca.getNote(noteId);
 
     if (!note) {
-        return res.status(404).send(`Note ${noteId} doesn't exist.`);
+        return res.setHeader("Content-Type", "text/plain")
+            .status(404)
+            .send(`Note ${noteId} doesn't exist.`);
     }
 
     if (note.isProtected && !protectedSessionService.isProtectedSessionAvailable()) {

src/routes/api/image.js

@@ -20,20 +20,22 @@ function returnImage(req, res) {
     }
 
     /**
-     * special "image" type. the canvas is actually type application/json 
+     * special "image" type. the canvas is actually type application/json
      * to avoid bitrot and enable usage as referenced image the svg is included.
      */
     if (image.type === 'canvas') {
         const content = image.getContent();
         try {
             const data = JSON.parse(content);
-            
+
             const svg = data.svg || '<svg />'
             res.set('Content-Type', "image/svg+xml");
             res.set("Cache-Control", "no-cache, no-store, must-revalidate");
             res.send(svg);
         } catch(err) {
-            res.status(500).send("there was an error parsing excalidraw to svg");
+            res.setHeader("Content-Type", "text/plain")
+                .status(500)
+                .send("there was an error parsing excalidraw to svg");
         }
     } else {
         res.set('Content-Type', image.mime);

src/routes/api/note_revisions.js

@@ -65,11 +65,15 @@ function downloadNoteRevision(req, res) {
     const noteRevision = becca.getNoteRevision(req.params.noteRevisionId);
 
     if (noteRevision.noteId !== req.params.noteId) {
-        return res.status(400).send(`Note revision ${req.params.noteRevisionId} does not belong to note ${req.params.noteId}`);
+        return res.setHeader("Content-Type", "text/plain")
+            .status(400)
+            .send(`Note revision ${req.params.noteRevisionId} does not belong to note ${req.params.noteId}`);
     }
 
     if (noteRevision.isProtected && !protectedSessionService.isProtectedSessionAvailable()) {
-        return res.status(401).send("Protected session not available");
+        return res.setHeader("Content-Type", "text/plain")
+            .status(401)
+            .send("Protected session not available");
     }
 
     const filename = getRevisionFilename(noteRevision);