为何Postman与.NET MAUI发送相同API请求返回不同响应？

使用Postman和.NET MAUI应用调用同一登录API时，返回的验证错误响应不一致。该API端点负责验证邮箱和密码字段，Postman能返回所有验证错误，而.NET MAUI仅返回单条错误信息。

API控制器实现 #

以下是处理登录请求的API控制器相关代码段：

[ApiController]
[ApiVersion(ApiVersions.V1)]
[Route("api/v{version:apiVersion}/users")]

public class UsersController (ISender sender, IMapper mapper) : ControllerBase
{
    [HttpPost("login")]
    public async Task<IActionResult> Login([FromBody] LogInUserRequest request, CancellationToken cancellationToken)
    {
        var command = new LogInUserCommand(request.Email, request.Password);
        Result<string> result = await sender.Send(command, cancellationToken);

        if (result.IsFailure)
        {
            return Unauthorized(result.Error);
        }

        var response = new AccessTokenResponse(result.Value);
        return Ok(response);
    }
}

API详情 #

• 端点：domain.com/api/v1/users/login
• 请求方法：POST
• Content-Type: application/json

请求体：

{
  "email": "",
  "password": ""
}

Postman响应 #

使用Postman发送请求时，收到包含多条验证信息的详细错误响应：

{
  "type": "ValidationFailure",
  "title": "Validation error",
  "status": 400,
  "detail": "One or more validation errors has occurred",
  "errors": [
    {
      "propertyName": "Email",
      "errorMessage": "'Email' must not be empty."
    },
    {
      "propertyName": "Email",
      "errorMessage": "'Email' is not a valid email address."
    },
    {
      "propertyName": "Password",
      "errorMessage": "'Password' must not be empty."
    },
    {
      "propertyName": "Password",
      "errorMessage": "The length of 'Password' must be at least 6 characters. You entered 0 characters."
    }
  ]
}

.NET MAUI响应 #

使用.NET MAUI应用通过HttpClient发送同一请求时，响应内容更简略，仅返回一条验证错误信息：

{
  "type": "https://tools.ietf.org/html/rfc9110#section-15.5.1",
  "title": "One or more validation errors occurred.",
  "status": 400,
  "errors": {
    "Email": ["The Email field is required."]
  },
  "traceId": "00-bc587b4c97e7b25236f0e375e0b4bc4a-e7b5ce673a92e452-00"
}

.NET MAUI实现代码 #

以下是.NET MAUI应用中使用的代码：

public class AccountService(IHttpClientFactory httpClientFactory)
{
    public async Task<Result<AccessTokenResponse>> LoginAsync(LogInUserRequest model)
    {
        using HttpClient client = httpClientFactory.CreateClient("SpardaApiClient");
        try
        {
            var content = new StringContent(JsonSerializer.Serialize(model), Encoding.UTF8, "application/json");
            var response = await client.PostAsync($"users/login", content);

            if (response.IsSuccessStatusCode)
            {
                var responseData = await response.Content.ReadFromJsonAsync<AccessTokenResponse>();

                return Result.Success<AccessTokenResponse>(responseData);
            }

            var errorContent = await response.Content.ReadAsStringAsync();
            var result = HandleErrorResponse(errorContent, response.StatusCode);
            return result;


        }
        catch (Exception ex)
        {
            return Result.Failure<AccessTokenResponse>(Error.Validation());
        }
    }
}

疑问 #

是什么原因导致API对Postman和.NET MAUI发送的相同请求返回不同响应？Postman与HttpClient在请求处理或响应处理上是否存在已知差异可以解释这种不一致？恳请提供相关见解或建议！

内容的提问来源于stack exchange，提问作者Karwan E. Othman