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我想通过HTTP POST发送文本和图像，并且总是收到400错误。我想用它通过电报机器人发送图像，我使用的是这个答案中提供的代码，其文本和咬合参数为https://stackoverflow.com/a/2793153/1970613，并做了小的修改。JAVA HttpsConnection POST发送图像和文本
什么可能是错误？非常感谢先进！
String param = "chat_id=mi_id&photo=";
String charset = "UTF-8";
String request = "https://api.telegram.org/bot-botCOde/sendPhoto";
URL url = new URL(request);
File binaryFile = new File("/home/joseantonio/imagen.jpg");
String CRLF = "\r\n"; // Line separator required by multipart/form-data.
String boundary = Long.toHexString(System.currentTimeMillis());
HttpURLConnection conn= (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setInstanceFollowRedirects(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("charset", "utf-8");
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
conn.setUseCaches(false);
try{
OutputStream output = conn.getOutputStream();
PrintWriter writer = new PrintWriter(new OutputStreamWriter(output, charset), true);
writer.append("--" + boundary).append(CRLF);
writer.append("Content-Disposition: form-data; name=\"param\"").append(CRLF);
writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF);
writer.append(CRLF).append(param).append(CRLF).flush();
writer.append("--" + boundary).append(CRLF);
writer.append("Content-Disposition: form-data; name=\"binaryFile\"; filename=\"" + binaryFile.getName() + "\"").append(CRLF);
writer.append("Content-Type: image/jpg").append(CRLF);
writer.append("Content-Transfer-Encoding: binary").append(CRLF);
writer.append(CRLF).flush();
Files.copy(binaryFile.toPath(), output);
output.flush(); // Important before continuing with writer!
writer.append(CRLF).flush(); // CRLF is important! It indicates end of boundary.
// End of multipart/form-data.
writer.append("--" + boundary + "--").append(CRLF).flush();
int responseCode2 = conn.getResponseCode();
System.out.println("\nSending 'GET' request to URL : " + request);
System.out.println("Response Code : " + responseCode2);