# Serving Multiple Sites

Module switcher provides host switch functionality for [Macaron](https://github.com/go-macaron/macaron).

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

## Installation

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

## Usage

If you want to run 2 instances in one program, Host Switcher is the feature you're looking for.

```go
func main() {
    m1 := macaron.Classic()
    // Register m1 middlewares and routers.

    m2 := macaron.Classic()
    // Register m2 middlewares and routers.

    hs := switcher.NewHostSwitcher()
    // Set instance corresponding to host address.
    hs.Set("gowalker.org", m1)
    hs.Set("gogs.io", m2)
    hs.Run()
}
```

By default, this program will listen on ports `4000`(for `m1`) and `4001`(for `m2`) in `macaron.DEV` mode just for convenience. And only listen on `4000` in `macaron.PROD` mode.

### Dynamic match

In case you have different subdomains that need only one Macaron instance:

```go
// ...
m := macaron.Classic()
// Register m middlewares and routers.

hs := macaron.NewHostSwitcher()
// Set instance corresponding to host address.
hs.Set("*.example.com", m)
hs.Run()
// ...
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://go-macaron.com/middlewares/switcher.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.