diff --git a/src/middlewares/parsers/body.parse.ts b/src/middlewares/parsers/body.parse.ts
index 3a9e90f0..fdbddf17 100644
--- a/src/middlewares/parsers/body.parse.ts
+++ b/src/middlewares/parsers/body.parse.ts
@@ -1,4 +1,3 @@
-import { Ajv } from 'ajv';
 import { ContentType } from '../util';
 
 import {
@@ -7,10 +6,6 @@ import {
   UnsupportedMediaType,
 } from '../../framework/types';
 
-type SchemaObject = OpenAPIV3.SchemaObject;
-type ReferenceObject = OpenAPIV3.ReferenceObject;
-type Schema = ReferenceObject | SchemaObject;
-
 export class BodySchemaParser {
   constructor() {
   }
diff --git a/src/middlewares/util.ts b/src/middlewares/util.ts
index f654b88b..1d747bc5 100644
--- a/src/middlewares/util.ts
+++ b/src/middlewares/util.ts
@@ -11,12 +11,12 @@ export class ContentType {
   private constructor(contentType: string | null) {
     this.contentType = contentType;
     if (contentType) {
-      this.withoutBoundary = contentType.replace(/;\s{0,}boundary.*/, '');
-      this.mediaType = this.withoutBoundary.split(';')[0].trim();
-      this.charSet = this.withoutBoundary.split(';')[1];
+      this.withoutBoundary = contentType.replace(/;\s{0,}boundary.*/, '').toLowerCase();
+      this.mediaType = this.withoutBoundary.split(';')[0].toLowerCase().trim();
+      this.charSet = this.withoutBoundary.split(';')[1]?.toLowerCase();
       this.isWildCard = RegExp(/^[a-z]+\/\*$/).test(this.contentType);
       if (this.charSet) {
-        this.charSet = this.charSet.trim();
+        this.charSet = this.charSet.toLowerCase().trim();
       }
     }
   }
diff --git a/test/content.type.spec.ts b/test/content.type.spec.ts
index 210f3ce5..9db4fbbf 100644
--- a/test/content.type.spec.ts
+++ b/test/content.type.spec.ts
@@ -1,4 +1,4 @@
-import { findResponseContent, ContentType } from '../src/middlewares/util';
+import { findResponseContent } from '../src/middlewares/util';
 import { expect } from 'chai';
 
 describe('contentType', () => {
diff --git a/test/headers.spec.ts b/test/headers.spec.ts
index 3529c23b..25aa4dca 100644
--- a/test/headers.spec.ts
+++ b/test/headers.spec.ts
@@ -59,5 +59,16 @@ describe(packageJson.name, () => {
           tag: 'cat',
         })
         .expect(200));
+
+    it('should match mediatype when charset case does not match the case defined in the spec', async () =>
+      request(app)
+        .post(`${app.basePath}/pets_charset`)
+        .set('Content-Type', 'application/json; charset=UTF-8')
+        .set('Accept', 'application/json; charset=UTF-8')
+        .send({
+          name: 'myPet',
+          tag: 'cat',
+        })
+        .expect(200));
   });
 });
diff --git a/test/response.validation.spec.ts b/test/response.validation.spec.ts
index 74e3a1c6..f3e2647d 100644
--- a/test/response.validation.spec.ts
+++ b/test/response.validation.spec.ts
@@ -91,6 +91,15 @@ describe(packageJson.name, () => {
         expect(r.body.id).to.be.a('number').that.equals(213);
       }));
 
+  it('should return 200 on valid responses 200 $ref', async () =>
+    request(app)
+      .get(`${app.basePath}/ref_response_body`)
+      .set('Accept', 'APPLICATION/JSON')
+      .expect(200)
+      .then((r: any) => {
+        expect(r.body.id).to.be.a('number').that.equals(213);
+      }));
+
   it('should fail if response field has a value of incorrect type', async () =>
     request(app)
       .get(`${app.basePath}/pets?mode=bad_type`)