fix: use SCRequestBodyTooLargeError

fixes #20

src/app.ts

@@ -14,8 +14,8 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 import {
-  SCInternalServerErrorResponse,
   SCNotFoundErrorResponse,
+  SCRequestBodyTooLargeErrorResponse,
   SCSyntaxErrorResponse,
   SCUnsupportedMediaTypeErrorResponse,
 } from '@openstapps/core';
@@ -47,11 +47,14 @@ async function configureApp() {
 
   // only accept json as content type for all requests
   app.use((req, res, next) => {
-    // Get the content type
+    // get the content type
     let contentType = '';
+    // the content type can be string, string[] or undefined
     if (typeof req.headers['Content-Type'] === 'string') {
+      // weird type definitions require an explicit cast
       contentType = req.headers['Content-Type'] as string;
     } else if (typeof req.headers['content-type'] === 'string') {
+      // weird type definitions require no cast here though...
       contentType = req.headers['content-type'];
     }
 
@@ -70,7 +73,7 @@ async function configureApp() {
       if (bodySize > 512 * 1024) {
         req.off('data', chunkGatherer);
         req.off('end', endCallback);
-        const err = new SCInternalServerErrorResponse(new Error('Request body is too large!'), isTestEnvironment);
+        const err = new SCRequestBodyTooLargeErrorResponse(isTestEnvironment);
         res.status(err.statusCode);
         res.json(err);
         return;