{/* Start Go Custom HTTP Client */}
The Go SDK makes API calls that wrap an internal HTTP client. The requirements for the HTTP client are very simple. It must match this interface:

```go
type HTTPClient interface {
	Do(req *http.Request) (*http.Response, error)
}
```

The built-in `net/http` client satisfies this interface and a default client based on the built-in is provided by default. To replace this default with a client of your own, you can implement this interface yourself or provide your own client configured as desired. Here's a simple example, which adds a client with a 30 second timeout.

```go
import (
	"net/http"
	"time"
	"github.com/myorg/your-go-sdk"
)

var (
	httpClient = &http.Client{Timeout: 30 * time.Second}
	sdkClient  = sdk.New(sdk.WithClient(httpClient))
)
```

This can be a convenient way to configure timeouts, cookies, proxies, custom headers, and other low-level configuration.
{/* End Go Custom HTTP Client */}