如何在C# HttpClient中添加Header允许Salesforce插入重复联系人记录

要通过API绕开Salesforce的重复校验、直接创建新联系人记录，你需要在请求中添加Sforce-Duplicate-Rule-Header头，取值设为allowSave=true。以下是具体实现方式：

• 全局添加Header（所有请求生效）
  如果你的HttpClient实例只用来处理这类需要跳过重复校验的请求，可以直接给实例的默认请求头添加配置：

  var httpClient = new HttpClient();
  // 添加重复规则允许Header
  httpClient.DefaultRequestHeaders.Add("Sforce-Duplicate-Rule-Header", "allowSave=true");
  
  // 后续构造请求体、发送请求的逻辑不变
  var contactPayload = new { FirstName = "张三", LastName = "李四", Email = "zhangsan@example.com" };
  var content = new StringContent(
      System.Text.Json.JsonSerializer.Serialize(contactPayload),
      System.Text.Encoding.UTF8,
      "application/json"
  );
  var response = await httpClient.PostAsync("https://your-salesforce-instance/services/data/v59.0/sobjects/Contact/", content);
  response.EnsureSuccessStatusCode();
  

• 单个请求添加Header（更灵活）
  若只有部分请求需要跳过重复校验，建议针对特定请求单独添加Header，避免影响其他接口调用：

  var httpClient = new HttpClient();
  var request = new HttpRequestMessage(HttpMethod.Post, "https://your-salesforce-instance/services/data/v59.0/sobjects/Contact/");
  
  // 仅给当前请求添加重复规则允许Header
  request.Headers.Add("Sforce-Duplicate-Rule-Header", "allowSave=true");
  
  // 设置请求体
  var contactPayload = new { FirstName = "张三", LastName = "李四", Email = "zhangsan@example.com" };
  request.Content = new StringContent(
      System.Text.Json.JsonSerializer.Serialize(contactPayload),
      System.Text.Encoding.UTF8,
      "application/json"
  );
  
  // 发送请求
  var response = await httpClient.SendAsync(request);
  response.EnsureSuccessStatusCode();
  

• 额外注意

  • 确认你的Salesforce账号已开启对应重复规则，且当前API调用账号拥有跳过重复校验的权限
  • 若后续需要恢复默认校验逻辑，可移除全局Header：httpClient.DefaultRequestHeaders.Remove("Sforce-Duplicate-Rule-Header")

内容的提问来源于stack exchange，提问作者Wasif