java – HttpURLConnection conn.getRequestProperty返回null

我正在尝试将一些数据推送到BES的URL(MDS_CS)

当我在我的代码中设置一些请求标头并提交请求时,提交请求的标头设置为null.

这是我的代码：

HttpURLConnection conn =(HttpURLConnection)url.openConnection();
        conn.setDoInput(true);//For receiving the confirmation
        conn.setDoOutput(true);//For sending the data
        conn.setRequestMethod("POST");//Post the data to the proxy
        conn.setRequestProperty("X-Rim-Push-ID",pushId);
        conn.setRequestProperty("Content-Type","text/html");
        conn.setRequestProperty("X-Rim-Push-Title","-message");
        conn.setRequestProperty("X-Rim-Push-Type","browser-message");                 
        conn.setRequestProperty("X-Rim-Push-Dest-Port","7874");            
        //Write the data
        OutputStream out = conn.getOutputStream();
        out.write(data.getBytes());
        out.close();

        System.out.println(conn.getHeaderField("X-Rim-Push-ID"));

当我尝试检索X-Rim-Push-Title时,最后一行返回null为NULL
只有正确检索的X-Rim-Push-ID,

请帮我

解决方法

如果您想查看所有REQUEST标头,您可以：

for (String header : conn.getRequestProperties().keySet()) {
   if (header != null) {
     for (String value : conn.getRequestProperties().get(header)) {
        System.out.println(header + ":" + value);
      }
   }
}

或者在连接后,您可以打印出RESPONSE标题：

for (String header : conn.getHeaderFields().keySet()) {
   if (header != null) {
     for (String value : conn.getHeaderFields().get(header)) {
        System.out.println(header + ":" + value);
      }
   }
}

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