Set a Multipart Part Body from a StringBuilder

Demonstrates Rest.SetMultipartBodySb, which sets the text body of the selected multipart part from a StringBuilder.

Background. A multipart request is assembled part by part: the part selector chooses the part being built, header fields describe it, and a SetMultipartBody method supplies its content. The request is then sent with a multipart send or full-request method.

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    success := false

    rest := chilkat.NewRest()
    bTls := true
    bAutoReconnect := true
    success = rest.Connect("example.com",443,bTls,bAutoReconnect)
    if success == false {
        fmt.Println(rest.LastErrorText())
        rest.DisposeRest()
        return
    }

    //  Select the multipart part to build, and set its header fields.
    rest.SetPartSelector("1")
    rest.AddHeader("Content-Disposition","form-data; name=\"field1\"")
    rest.AddHeader("Content-Type","application/json")

    //  Set the text body of the selected part from a StringBuilder.
    sbBody := chilkat.NewStringBuilder()
    sbBody.Append("{ \"key\": \"value\" }")
    success = rest.SetMultipartBodySb(sbBody)
    if success == false {
        fmt.Println(rest.LastErrorText())
        rest.DisposeRest()
        sbBody.DisposeStringBuilder()
        return
    }

    responseText := rest.FullRequestMultipart("POST","/api/upload")
    if rest.LastMethodSuccess() == false {
        fmt.Println(rest.LastErrorText())
        rest.DisposeRest()
        sbBody.DisposeStringBuilder()
        return
    }

    fmt.Println(*responseText)

    rest.DisposeRest()
    sbBody.DisposeStringBuilder()