Slack API使用 作为新行在chat.postMessage（golang）中不起作用

I'm using the Slack web API to post messages to a channel in Go. I'm trying to support multi-line messages in the text field. According to the documentation simply adding a should work but it's not working. When posting the appears in the text and there's no line break.

Here's the code I'm using:

func PostMessage(token, channelName, userName, text string) error {
    uv := url.Values{}
    uv.Add("token", token)
    uv.Add("channel", channelName)
    uv.Add("username", userName)
    uv.Add("text", text)

    resp, err := http.PostForm("https://slack.com/api/chat.postMessage", uv)
    if err != nil {
        return err
    }
    return nil
}

func main() {
    if err := PostMessage("xxxx", "#test-channel", "API", "This should be the first line
This should be the second line"); err != nil {
        panic(err)
    }
}

I figured out the issue. The sample I originally posted will actually work as intended. I simplified the original code which was a command line application where the text is a parameter passed as a CLI flag so it looked a little like this:

cliapp --text="one
two"

The variable that held the value for this flag wasn't actually escaping the character so it was ACTUALLY:

"one\
two"

I used a simple string replacement to fix the values:

text = strings.Replace(text, "\
", "
", -1)

Just escape the newline " " with "`n"

Reference: https://ss64.com/ps/syntax-esc.html

I was using Java and i did

message.replace("\
","
")

and it worked.