package main import ( "fmt" "net/http" "strings" ) func main() { // create a new http request body := strings.NewReader("Some data") req, err := http.NewRequest("POST", "https://example.com/api", body) // if there was an error, handle it if err != nil { fmt.Println("Error creating request:", err) return } // set the content length req.ContentLength = int64(len("Some data")) // send the request and handle the response client := http.Client{} resp, err := client.Do(req) // if there was an error, handle it if err != nil { fmt.Println("Error sending request:", err) return } // print the response body bodyBytes, _ := ioutil.ReadAll(resp.Body) fmt.Println("Response body:", string(bodyBytes)) }In this example, we create a new POST request with a request body containing the string "Some data". We then set the ContentLength property to the length of the request body and send the request using the http.Client{}. Finally, we read the response body and print it to the console. This example uses the ioutil package to read the response body, which is part of the standard library and does not require any additional imports. However, the net/http package is the one responsible for handling the Request object and setting the ContentLength property.