# Gzip

Middleware gzip provides compress to responses for Macaron [Instances](/core_concepts.md#instances). Make sure to register it before other middlewares that write content to response.

* [GitHub](https://github.com/go-macaron/gzip)
* [API Reference](https://gowalker.org/github.com/go-macaron/gzip)

## Installation

```bash
go get github.com/go-macaron/gzip
```

## Usage

```go
package main

import (
    "github.com/go-macaron/gzip"
    "gopkg.in/macaron.v1"
)

func main() {
    m := macaron.Classic()
    m.Use(gzip.Gziper())
    // Register routers.
    m.Run()
}
```

In this case, the static files will not be compressed by Gzip, to compress them:

```go
package main

import (
    "github.com/go-macaron/gzip"
    "gopkg.in/macaron.v1"
)

func main() {
    m := macaron.New()
    m.Use(macaron.Logger())
    m.Use(macaron.Recovery())
    m.Use(gzip.Gziper())
    m.Use(macaron.Static("public"))
    // Register routers.
    m.Run()
}
```

Or you can choose to only compress a group of routes' responses:

```go
// ...

func main() {
    m := macaron.Classic()
    m.Group("/gzip", func() {
        // ...
    }, gzip.Gziper())
    // ...
    m.Run()
}
```

## Options

This service comes with a variety of configuration options([`gzip.Options`](https://gowalker.org/github.com/go-macaron/gzip#Options)):

```go
// ...
m.Use(gzip.Gziper(gzip.Options{
    // Compression level. Can be DefaultCompression(-1), ConstantCompression(-2)
    // or any integer value between BestSpeed(1) and BestCompression(9) inclusive.
    // Default is 4.
    CompressionLevel: 4,
}))
// ...
```


---

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