Makes sure event.body is a string

Author: Martin Jesper Low Madsen

proxy.js

@@ -15,6 +15,13 @@ async function handler(event, context, callback) {
     clientContext: JSON.parse(Buffer.from(ClientContext, 'base64')),
   };
 
+  switch (targetEvent.headers['content-type']) {
+  case 'application/json':
+  default:
+    targetEvent.body = typeof targetEvent.body === 'string' ? targetEvent.body : JSON.stringify(targetEvent.body);
+    break;
+  }
+
   // call the target function
   return target[targetHandlerFunction](targetEvent, targetContext, (error, response) => {
     if (error) {