---
lang: en
title: 'API docs: rest.resthttperrors.unsupportedmediatype'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/rest
permalink: /doc/en/lb4/apidocs.rest.resthttperrors.unsupportedmediatype.html
---

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[Home](./index.md) &gt; [@loopback/rest](./rest.md) &gt; [RestHttpErrors](./rest.resthttperrors.md) &gt; [unsupportedMediaType](./rest.resthttperrors.unsupportedmediatype.md)

## RestHttpErrors.unsupportedMediaType() function

**Signature:**

```typescript
function unsupportedMediaType(contentType: string, allowedTypes?: string[]): HttpErrors.HttpError<415> & {
        code: string;
        contentType: string;
        allowedMediaTypes: string[];
    };
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  contentType | string |  |
|  allowedTypes | string\[\] | _(Optional)_ |

**Returns:**

HttpErrors.HttpError&lt;415&gt; &amp; { code: string; contentType: string; allowedMediaTypes: string\[\]; }