Brother, please help me take a look at this java2php.

Is the header they talk about the same as the header using curl?

 ...
   URL httpUrl = new URL(billing_url);
   HttpURLConnection http = (HttpURLConnection)httpUrl.openConnection();
   http.setRequestProperty("opcode", String.valueOf(opcode)); //Header
   http.setRequestProperty("appkey",appkey); //Header
   http.setRequestProperty("sign", sign); //Header
   http.setRequestProperty("tag", String.valueOf(tag)); //Header
   http.setRequestProperty("channelId",String.valueOf(channelId)); //Header
   http.setConnectTimeout(3000);
   http.setRequestMethod("POST"); //post method
   http.setDoInput(true);
   http.setDoOutput(true);
   PrintWriter out = new PrintWriter(http.getOutputStream());
   out.print("data="+data); //Pay attention to the data transmission method
   out.flush();
   ...
 

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Is the header they are talking about the same as the header using curl?

 ...
   URL httpUrl = new URL(billing_url);
   HttpURLConnection http = (HttpURLConnection)httpUrl.openConnection();
   http.setRequestProperty("opcode", String.valueOf(opcode)); //Header
   http.setRequestProperty("appkey",appkey); //Header
   http.setRequestProperty("sign", sign); //Header
   http.setRequestProperty("tag", String.valueOf(tag)); //Header
   http.setRequestProperty("channelId",String.valueOf(channelId)); //Header
   http.setConnectTimeout(3000);
   http.setRequestMethod("POST"); //post method
   http.setDoInput(true);
   http.setDoOutput(true);
   PrintWriter out = new PrintWriter(http.getOutputStream());
   out.print("data="+data); //Pay attention to the data transmission method
   out.flush();
   ...