fix: parse application/*+json request bodies as JSON

src/server.ts

@@ -69,6 +69,13 @@ export function getServer(
     limit: requestLimit,
     verify: rawBodySaver,
   };
+  // Parse structured syntax suffix types such as application/vnd.api+json as
+  // JSON too (RFC 6839). application/cloudevents+json is matched by the
+  // CloudEvents parser first.
+  const jsonBodySavingOptions = {
+    ...defaultBodySavingOptions,
+    type: ['application/json', 'application/*+json'],
+  };
   const cloudEventsBodySavingOptions = {
     type: 'application/cloudevents+json',
     limit: requestLimit,
@@ -89,7 +96,7 @@ export function getServer(
 
   // Apply middleware
   app.use(bodyParser.json(cloudEventsBodySavingOptions));
-  app.use(bodyParser.json(defaultBodySavingOptions));
+  app.use(bodyParser.json(jsonBodySavingOptions));
   app.use(bodyParser.text(defaultBodySavingOptions));
   app.use(bodyParser.urlencoded(urlEncodedOptions));
   // The parser will process ALL content types so MUST come last.

test/integration/http.ts

@@ -117,4 +117,18 @@ describe('HTTP Function', () => {
       assert.strictEqual(callCount, test.expectedCallCount);
     });
   });
+
+  ['application/vnd.api+json', 'application/merge-patch+json'].forEach(
+    contentType => {
+      it(`parses a ${contentType} body as JSON`, async () => {
+        const response = await supertest(getTestServer('testHttpFunction'))
+          .post('/')
+          .set('Content-Type', contentType)
+          .send(JSON.stringify({text: 'hello'}));
+
+        assert.deepStrictEqual(response.body, {result: 'hello'});
+        assert.strictEqual(response.status, 200);
+      });
+    },
+  );
 });