对 Microsoft Graph API 的 Java 请求执行正常，但返回 500答案

【问题标题】：Java requests to Microsoft Graph API perform ok but return 500对 Microsoft Graph API 的 Java 请求执行正常，但返回 500
【发布时间】：2020-10-21 07:14:55
【问题描述】：

我有一个带有 3 种方法的小型 Java 程序：

用于从图形 api 获取令牌以进行身份验证承载令牌。没关系，token 没问题，返回 200 http
另外两个用于在 Azure AD 中创建用户并分配许可证。首先，创建用户。令牌正常，用户已创建，平台上的身份验证工作正常（密码设置正常）。但响应我得到 500 http 即使任务在 AzureAD 中正确完成。如果我在 PowerShell 中发出相同的请求，则没有问题，没有错误。请帮我一个建议。我创建用户的方法是：

public static String createUser(String token) {
        String user = "{\n"
                + "  \"accountEnabled\": true,\n"
                + "  \"displayName\": \"displayName-value\",\n"
                + "  \"mailNickname\": \"mailNickname-value\",\n"
                + "  \"userPrincipalName\": \"upn@microsoft.ro\",\n"
                + "  \"passwordProfile\" : {\n"
                + "    \"forceChangePasswordNextSignIn\": false,\n"
                + "    \"password\": \"Complexity2021\"\n"
                + "  },\n"
                + " \"usageLocation\" : \"RO\""
                + "}";
        HttpURLConnection conn = null;
        URL url = null;
        try {
            url = new URL("https://graph.microsoft.com/beta/users");
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty("Authorization", "Bearer " + token);
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.connect();
            OutputStream os = conn.getOutputStream();
            os.write(user.getBytes());
            os.flush();
            int status = conn.getResponseCode();
            System.out.println(status); // 500!!!!! AND THE USER is ok in AzureAD
            switch (status) {
                case 200:
                case 201:
                    BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                    StringBuilder sb = new StringBuilder();
                    String line;
                    while ((line = br.readLine()) != null) {
                        sb.append(line + "\n");
                    }
                    br.close();
                    return sb.toString();
            }

        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            if (conn != null) {
                try {
                    conn.disconnect();
                } catch (Exception ex1) {
                    ex1.printStackTrace();
                }
            }
        }
        return null;
    }

【问题讨论】：

标签： java http azure-active-directory microsoft-graph-api

【解决方案1】：

您忽略了服务器返回的错误数据 - 但根据文档，它是should explain the cause of the 500 status。建议代码：

        // ...
        System.out.println(status); // 500!!!!! AND THE USER is ok in AzureAD
        
        // always reads server response
        StringBuilder sb = new StringBuilder();
        try (BufferedReader br = 
                new BufferedReader(new InputStreamReader(conn.getInputStream())) {
            String line;
            while ((line = br.readLine()) != null) {
                  sb.append(line + "\n");
            }
        } // <-- br is automatically closed here!

        String output = sb.toString();
        if (status == 200 || status == 201) {
            return output;
        } else {
            // choose a suitable exception, or return null but log error
            throw new FooException("Received error " + status + 
                    " while doing Foo; details follow: " + output);
        }
        // ...

我还建议用try-with-resources 版本替换所有try { } finally { } 的免费资源——它们更安全（总是关闭获取的资源）并且更具可读性。

【讨论】：

【解决方案2】：

感谢您的回复，我检查了 errorStream 并包含：

{
  "error": {
    "code": "InternalServerError",
    "message": "The MIME type 'text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2' requires a '/' character between type and subtype, such as 'text/plain'.",
    "innerError": {
      " 
    }
  }
}

解决办法是：

conn.setRequestProperty("Accept", "application/json");

谢谢！

【讨论】：