Android HttpURLConnection POST RequestMethod 会导致 400 错误代码

Question

我必须传递很长的OpenStreetMapsoverpass api url请求。由于 GET 请求太长，我决定使用 POST 请求。不幸的是，更改 RequestMethod 会解析 400 个错误代码(使用 GET 方法相同的查询会产生 200 个代码(。

这是我的HttpURLConnection代码：

public String downloadUrl(String strUrl) throws IOException {
    String data = "";
    InputStream iStream = null;
    HttpURLConnection urlConnection = null;
    try{
        URL url = new URL(strUrl);
        // Creating an http connection to communicate with url
        urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestMethod("POST");
        Log.wtf("JSON","connection started...");
        // Connecting to url
        urlConnection.setRequestProperty("Content-Type", "application/json");
        urlConnection.connect();
        Log.wtf("KOD",Integer.toString(urlConnection.getResponseCode()));
        // Reading data from url
        iStream = new BufferedInputStream(urlConnection.getInputStream());
        BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
        StringBuilder sb = new StringBuilder();
        String line = "";
        while( ( line = br.readLine()) != null){
            sb.append(line);
        }
        data = sb.toString();
        br.close();
    }catch(Exception e){
        Log.wtf("ExceptionWhileUrlDownload", e.toString());
    }finally{
        iStream.close();
        urlConnection.disconnect();
    }
    return data;
}

Answer 1

删除应用程序/json

从 URL 中删除查询。然后将该查询字符串写入输出流。之后，您可以从输入流中读取

Answer 2

>HTTP 错误 400 是错误的请求错误。这意味着您发送了错误的请求。当您使用 GET 获得 HTTP 200 和带有 POST 的 HTTP 400 时，您调用的 HTTP 方法是 GET 而不是 POST。因此，您不能向GET方法发送POST请求。