Enable the gzip of response content.

# Swoole\Http\Response::gzip

(PECL swoole >= 1.9.0)

Swoole\Http\Response::gzip — Enable the gzip of response content.

### Description

public Swoole\Http\Response::gzip(string `$compress_level` = ?): ReturnType

The header about Content-Encoding will be added automatically.

### Parameters

`compress_level`

### Return Values

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