错误代码：在 HttpsURLConnection 中收到 500

Question

我正在向需要基本身份验证的服务器发送 HttpsURLConnection 请求。我已经提供了授权值并对其进行了验证。但我收到了Http status 500: Internal Server error。这是我的代码：

public String httptest(String url, File f, String username, String password) throws Exception {
        // Task attachments endpoint           
        HttpsURLConnection connection = (HttpsURLConnection) new URL(url).openConnection();
        // Set basic auth header            
        String apiKey = username + ":" + password;
        String basicAuth = "Basic " + new String(new Base64().encode(apiKey.getBytes()));
        connection.setRequestProperty("Authorization", basicAuth);
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Connection", "Keep-Alive");
        logger.info("basicAuth: " + basicAuth);
        // Indicate a POST request
        connection.setDoOutput(true);

        // A unique boundary to use for the multipart/form-data
        String boundary = Long.toHexString(System.currentTimeMillis());
        String fboundary = "----WebKitFormBoundary" + boundary + "u0gW";
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + fboundary);
        // Construct the body of the request            
        logger.info("boundary: " + fboundary);
        PrintWriter writer = null;
        try {
            writer = new PrintWriter(new OutputStreamWriter(connection.getOutputStream(), "UTF-8"));

            String fileName = f.getName();
            String ffname = fileName.substring(fileName.lastIndexOf("\\")+1);
            writer.append("--" + fboundary).append(LINE_FEED);
            writer.append("Content-Disposition: multipart/form-data; name=\"file\"; filename=\"" + ffname + "\"").append(LINE_FEED);
            writer.append("Content-Type: application/x-zip-compressed").append(LINE_FEED); 
            writer.append(LINE_FEED);
            logger.info("fileName: " + fileName);
            BufferedReader reader = null;
            try {
                reader = new BufferedReader(new InputStreamReader(new FileInputStream(f), "UTF-8"));
                for (String line; (line = reader.readLine()) != null; ) {
                    writer.append(line).append(LINE_FEED);
                }
            } finally {
                if (reader != null) try {
                    reader.close();
                } catch (IOException logOrIgnore) {
                }
            }

            writer.append(LINE_FEED);
            writer.append("----" + fboundary).append(LINE_FEED);
            writer.append(LINE_FEED);
            writer.flush();
            writer.close();
        } catch (Exception e) {
            System.out.append("Exception writing file" + e);
        } finally {
            if (writer != null) writer.close();
        }
        logger.info("ResponseCode: " + connection.getResponseCode());
        //System.out.println(connection.getResponseCode()); // Should be 200
       return connection.getResponseMessage();
    }

当我通过邮递员客户端发送相同的请求时，它工作正常。以下是邮递员请求的标头：

授权：基本 c2dveWFsQHF1YXJrLmNvbTpRdWFyazEyMw== 缓存控制：无缓存邮递员令牌： d6fac5f0-e844-9bac-2bce-51580fdd5557 内容类型： 多部分/表单数据；边界=----WebKitFormBoundary7MA4YWxkTrZu0gW

----WebKitFormBoundary7MA4YWxkTrZu0gW Content-Disposition: form-data;名称=“文件”；文件名="Tiger522.zip" 内容类型： 应用程序/x-zip-压缩

----WebKitFormBoundary7MA4YWxkTrZu0gW

请告诉我该怎么做？

Answer 1

我可以看到两个可能的错误：

1. 正如 StephaneM 指出的：文件上传的 content-disposition 必须是“form-data”，而不是“multipart/form-data”：

   writer.append("Content-Disposition: form-data; name=\"file\";
   filename=\"" + ffname + "\"").append(LINE_FEED);
   

2. 您为文件上传指定“Content-Type: application/x-zip-compressed”。这意味着 zip 格式。但是，您只是使用 InputStreamReader 在其中写入文件。这似乎不是您正在编写的 zip 格式。