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---
lang: en
title: 'API docs: testlab.createclientforhandler'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/testlab
permalink: /doc/en/lb4/apidocs.testlab.createclientforhandler.html
---
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[Home](./index.md) > [@loopback/testlab](./testlab.md) > [createClientForHandler](./testlab.createclientforhandler.md)
## createClientForHandler() function
Create a SuperTest client connected to an HTTP server listening on an ephemeral port and calling `handler` to handle incoming requests.
**Signature:**
```typescript
export declare function createClientForHandler(handler: (req: http.IncomingMessage, res: http.ServerResponse) => void): Client;
```
## Parameters
<table><thead><tr><th>
Parameter
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td markdown="1">
handler
</td><td markdown="1">
(req: http.IncomingMessage, res: http.ServerResponse) => void
</td><td markdown="1">
</td></tr>
</tbody></table>
**Returns:**
[Client](./testlab.client.md)