import (
    "net/http"
    "io/ioutil"
    "fmt"
)

func main() {
    resp, err := http.Get("http://example.com/")
    if err != nil {
        // handle error
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        // handle error
    }
    fmt.Println(string(body))
}

import (
    "net/http"
    "bytes"
    "fmt"
)

func main() {
    url := "http://example.com/api"
    JSONData := []byte(`{"key":"value"}`)

    req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
    req.Header.Set("Content-Type", "application/json")
    
    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        // handle error
    }
    defer resp.Body.Close()
    
    // handle response
}

import (
    "fmt"
    "log"
    "net/url"
    "GitHub.com/gorilla/websocket"
)

func main() {
    u := url.URL{Scheme: "ws", Host: "echo.websocket.org", Path: "/"}
    fmt.Println("connecting to ", u.String())

    conn, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
    if err != nil {
        log.Fatal("dial:", err)
    }
    defer conn.Close()

    message := []byte("hello, world!")
    err = conn.WriteMessage(websocket.TextMessage, message)
    if err != nil {
        log.Println("write:", err)
        return
    }

    _, p, err := conn.ReadMessage()
    if err != nil {
        log.Println("read:", err)
        return
    }
    fmt.Printf("received: %s\n", p)
}