Parse.com REST API错误代码400：从Java HTTP请求到云功能无效请求(Par

我有我试图发送到Parse.com云功能的字符串。根据REST API文档（ https://www.parse.com/docs/rest#general-requests ），它必须在JSON格式，所以把它做成了JSON对象，并将其转换为一个字符串附加到http请求URL的末尾。

    JSONObject jsonParam = new JSONObject();
    jsonParam.put("emailId", emailId);
    String urlParameters = jsonParam.toString();

然后，我发送请求的话，在我试图以满足他们的卷曲的代码示例作为Java代码：

        con.setDoOutput(true);
        DataOutputStream wr = null;
        wr = new DataOutputStream(con.getOutputStream());
        wr.writeBytes(urlParameters);
        wr.flush();
        wr.close();

尽管如此，我收到的400返回错误代码错误消息“错误的请求”，我相信通过面目全非参数引起的被发送到云功能。没有在我的代码触发其他错误。然而，我通过控制台日志，这些日志验证emailId是一个正常的字符串，并将所得JSON对象，以及它.toString()相当于出来作为一个JSON对象的字符串正确读取。另外这个工作了其他功能我有在我创造我的解析数据库中的对象。那么为什么会在这里工作？

下面是引用和上下文的全功能：

private void sendEmailWithParse(String emailId) throws IOException {
    String url = "https://api.parse.com/1/functions/sendEmailNow";
    URL obj = new URL(url);
    HttpsURLConnection con = null;
    try {
        con = (HttpsURLConnection) obj.openConnection();
    } catch (IOException e) {
        System.out.println("Failed to connect to http link");
        e.printStackTrace();
    }

    //add request header
    try {
        con.setRequestMethod("POST");
    } catch (ProtocolException e) {
        System.out.println("Failed to set to POST");
        e.printStackTrace();
    }
    con.setRequestProperty("X-Parse-Application-Id", "**************************************");
    con.setRequestProperty("X-Parse-REST-API-Key", "************************************************");
    con.setRequestProperty("Content-Type", "application/json");

    JSONObject jsonParam = new JSONObject();
    jsonParam.put("emailId", emailId);
    System.out.println("parameter being sent to cloud function: " + jsonParam);
    System.out.println("parameter being sent to cloud function as string: " + jsonParam.toString());
    String urlParameters = jsonParam.toString();

    // Send post request
    con.setDoOutput(true);
    DataOutputStream wr = null;
    try {
        wr = new DataOutputStream(con.getOutputStream());
    } catch (IOException e1) {
        System.out.println("Failed to get output stream");
        e1.printStackTrace();
    }
    try {
        wr.writeBytes(urlParameters);
    } catch (IOException e) {
        System.out.println("Failed to connect to send over Parse object as parameter");
        e.printStackTrace();
    }
    try {
        wr.flush();
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        wr.close();
    } catch (IOException e) {
        System.out.println("Failed to connect to close datastream connection");
        e.printStackTrace();
    }

    int responseCode = 0;
    try {
        responseCode = con.getResponseCode();
    } catch (IOException e) {
        System.out.println("Failed to connect to get response code");
        e.printStackTrace();
    }
    System.out.println("\nSending 'POST' request to URL : " + url);
    System.out.println("Post parameters : " + urlParameters);
    System.out.println("Response Code : " + responseCode);
    System.out.println("Response message: " + con.getResponseMessage());
}

我用的解决了这个问题的HttpRequest外部库。它给了我的请求，更好的控制和对问题的调试变得更加容易制造。服务器已接收到该请求就好，问题是与JSON编码。而不是将JSON对象作为参数在所述请求，我其插入到HTTP请求的主体和以UTF-8编码它。

最后，这是工作的代码：

    String url = "https://api.parse.com/1/functions/sendEmailNow";
    URL obj = new URL(url);

    //Attempt to use HttpRequest to send post request to parse cloud
    HttpRequest request = HttpRequest.post(obj).contentType("application/json");
    request.header("X-Parse-Application-Id", "**************************");
    request.header("X-Parse-REST-API-Key", "********************");
    JSONObject jsonParam = new JSONObject();
    jsonParam.put("emailId", emailId);
    request.send(jsonParam.toString().getBytes("UTF8"));

    if (request.ok())
        System.out.println("HttpRequest WORKED");
    else
        System.out.println("HttpRequest FAILED " + request.code() + request.body());