if requestBody required is false, allow empty requests

src/middlewares/parsers/body.parse.ts

@@ -57,8 +57,13 @@ export class BodySchemaParser {
     }
 
     if (!content) {
+      // check if required is false, if so allow request when no content type is supplied
+      const contentNotProvided = contentType.contentType === 'not_provided';
+      if ((contentType.contentType === undefined || contentNotProvided) && requestBody.required === false) {
+        return {};
+      }
       const msg =
-        contentType.contentType === 'not_provided'
+        contentNotProvided
           ? 'media type not specified'
           : `unsupported media type ${contentType.contentType}`;
       throw new UnsupportedMediaType({ path: path, message: msg });

test/optional-request-body.spec.ts

@@ -32,6 +32,11 @@ describe(packageJson.name, () => {
       .set('Content-Type', 'application/json')
       .expect(201));
 
+  it('create document should return 201 with empty body', async () =>
+    request(app)
+      .post(`/documents`)
+      .expect(201));
+
   it('return 415', async () =>
     request(app)
       .post(`/documents`)

test/optional-request-body.yaml

@@ -10,6 +10,7 @@ paths:
     post:
       summary: Create a document
       requestBody:
+        required: false
         content:
           application/json:
             schema: