Java Put-Request 返回 400 错误请求

Question

我尝试对我编写的rest-api执行put-request，但它总是返回400-Bad Request。

java.io.IOException: Server returned HTTP response code: 400 for URL: http://localhost:8000/api/v0/contacts/2 at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)

我可以使用 firefox-rest 客户端插件以及另一个 Angular 客户端来调用该 url，所以我想我在 java 代码中配置了一些错误。

服务器总是返回一些东西，所以我不知道为什么当我尝试获取输入流时它会崩溃。

protected String put(String path, String parameters)
        throws IOException {

    HttpURLConnection connection = getConnection(path, "PUT", parameters);

    OutputStreamWriter outputWriter = new OutputStreamWriter(
            connection.getOutputStream());

    outputWriter.write(parameters);
    outputWriter.flush();
    outputWriter.close();

    InputStream is = connection.getInputStream();
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    String response = reader.readLine();
    while(response != null){
        response += reader.readLine();
    }
    reader.close();

    return response;
}


private HttpURLConnection getConnection(String path, String method,String params) throws MalformedURLException, IOException,
        ProtocolException {
    URL url = new URL(this.api + path);
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setDoOutput(true);
    connection.setDoInput(true);
    connection.setUseCaches(false);
    connection.setRequestMethod(method);
    connection.setRequestProperty("Content-Length",
            String.valueOf(params.length()));
    return connection;
}

抱歉英语不好，这不是我的母语。

Answer 1

我在cmd提示符下执行了ipconfig，它显示了192.168.1.3。我在 Android 应用程序中的 localhost 位置更改了它，现在我可以访问本地 Web 服务器了。