@loopback/docs/site/apidocs/rest.middlewaresequence.handle.md

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---
lang: en
title: 'API docs: rest.middlewaresequence.handle'
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.middlewaresequence.handle.html
---

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[Home](./index.md) &gt; [@loopback/rest](./rest.md) &gt; [MiddlewareSequence](./rest.middlewaresequence.md) &gt; [handle](./rest.middlewaresequence.handle.md)

## MiddlewareSequence.handle() method

Runs the default sequence. Given a handler context (request and response), running the sequence will produce a response or an error.

Default sequence executes these groups of middleware:

- `cors`<!-- -->: Enforces `CORS` - `openApiSpec`<!-- -->: Serves OpenAPI specs - `findRoute`<!-- -->: Finds the appropriate controller method, swagger spec and args for invocation - `parseParams`<!-- -->: Parses HTTP request to get API argument list - `invokeMethod`<!-- -->: Invokes the API which is defined in the Application controller method

In front of the groups above, we have a special middleware called `sendResponse`<!-- -->, which first invokes downstream middleware to get a result and handles the result or error respectively.

- Writes the result from API into the HTTP response (if the HTTP response has not been produced yet by the middleware chain. - Catches error logs it using 'logError' if any of the above steps in the sequence fails with an error.

**Signature:**

```typescript
handle(context: RequestContext): Promise<void>;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

context


</td><td markdown="1">

[RequestContext](./rest.requestcontext.md)


</td><td markdown="1">

The request context: HTTP request and response objects, per-request IoC container and more.


</td></tr>
</tbody></table>

**Returns:**

Promise&lt;void&gt;