(Go) SendGrid HTML Email with Embedded Images

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Demonstrates how to send an HTML email with embedded images using SendGrid.

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    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code

    req := chilkat.NewHttpRequest()
    http := chilkat.NewHttp()

    var success bool

    // First.. load a JPG file and build an HTML img tag with the JPG data inline encoded.
    // Our HTML img tag will look like this:
    // <img src="data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEA3ADcAA..." alt="" style="border-width:0px;" />
    bdJpg := chilkat.NewBinData()
    success = bdJpg.LoadFile("qa_data/jpg/starfish.jpg")
    if success == false {
        fmt.Println("Failed to load JPG file.")
        req.DisposeHttpRequest()
        http.DisposeHttp()
        bdJpg.DisposeBinData()
        return
    }

    // Note: HTML containing embedded base64 image data may not be visible in all email clients.
    // For example, GMail might not display the image, but viewing in Outlook might be OK.
    sbHtml := chilkat.NewStringBuilder()
    sbHtml.Append("<html><body><b>This is a test<b><br /><img src=\"data:image/jpeg;base64,")
    // Append the base64 image data to sbHtml.
    bdJpg.GetEncodedSb("base64",sbHtml)
    sbHtml.Append("\" alt=\"\" style=\"border-width:0px;\" /></body></html>")

    json := chilkat.NewJsonObject()
    json.UpdateString("personalizations[0].to[0].email","matt@chilkat.io")
    json.UpdateString("personalizations[0].to[0].name","Matt")
    json.UpdateString("from.email","admin@chilkatsoft.com")
    json.UpdateString("subject","Test HTML email with images")
    json.UpdateString("content[0].type","text/html")
    json.UpdateSb("content[0].value",sbHtml)

    http.SetAuthToken("SENDGRID_API_KEY")

    // resp is a HttpResponse
    resp := http.PostJson3("https://api.sendgrid.com/v3/mail/send","application/json",json)
    if http.LastMethodSuccess() != true {
        fmt.Println(http.LastErrorText())
    }
    else {
        fmt.Println("response status code: ", resp.StatusCode())
        // Display the response.
        // If successful, the response code is 202 and the response body string is empty.
        // (The response body string may also be empty for error response codes.)
        fmt.Println(resp.BodyStr())
        resp.DisposeHttpResponse()
    }


    req.DisposeHttpRequest()
    http.DisposeHttp()
    bdJpg.DisposeBinData()
    sbHtml.DisposeStringBuilder()
    json.DisposeJsonObject()