我使用JAVA HttpClient登录到一个API
然后HttpClient在一个循环中执行并使用这个函数（checkZipFile），第一次执行后，它挂起在client.execute(post)。

private String checkZipFile(HttpClient client, File zipFile){
        String errCode = "";
        try {
            HttpPost post = new HttpPost(URL_API);
            
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.addTextBody("command", "ImportCustomMaster");
            builder.addTextBody("type", "csvZip");
            builder.addBinaryBody(
              "dataFile", zipFile);
            builder.addTextBody("encoding", "932");
         
            HttpEntity multipart = builder.build();
            
            post.setEntity(multipart);
            HttpResponse response = client.execute(post); //<-- IT HANGS HERE
            System.out.println("\nSending 'POST' request to URL : " + URL_API);
            System.out.println("Post parameters : " + "dataFile: " + zipFile.getName());
            System.out.println("Response Code : " + response.getStatusLine().getStatusCode());

            BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
            StringBuffer result = new StringBuffer();
            String line = "";
            while ((line = rd.readLine()) != null) {
                result.append(line);
            }
            try {
                DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
                DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
                Document doc = dBuilder.parse(new InputSource(new StringReader(result.toString())));
                doc.getDocumentElement().normalize();

                Node nNode = doc.getElementsByTagName("error").item(0);
                if (nNode.getNodeType() == Node.ELEMENT_NODE) {
                    Element eElement = (Element) nNode;
                    errCode = eElement.getElementsByTagName("code").item(0).getTextContent();
                    System.out.println("Error Code : " + errCode);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            
            
        }catch (ConnectException e) {
            System.out.println(e.getMessage());
            return "";
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
        return errCode;
    }

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我不知道为什么，但至少，是API调用，然后它坚持，因为API或我的程序？有没有一些工具来调查？