ASP.NET Core 3.1 的主体是空的

Question

为了更好地理解，总结了下面的代码，它与 LOCALHOST 完美配合，但是，当我把它放在 IIS 中时，请求的主体总是到达 EMPTY。有人可以帮我吗？

客户端应用代码：

  login(userName: string, password: string): Observable<User> {

    const headers = new HttpHeaders({
      'Content-Type': 'application/json'
    });

    return this.http.post(`${environment.API_URL}/profiles/login`,
      { userName, password }, { headers }
    ).pipe(
      tap((currentUser: User) => {
        this.updateUser(currentUser)
          .then(
            () => {
              console.log('currentUser login stored: ', AppSettings.currentUser);
            },
            error => console.error('Error storing currentUser login', error)
          );
        return AppSettings.currentUser;
      }),
    );
  }

服务器上的 ASP.NET Core 3.1 应用程序代码：

    [Route("api/[controller]")]
    [ApiController]
    public class ProfilesController : ControllerBase
    {
        [HttpPost("login")]
        public async Task<ActionResult> Login(LoginRequest request)
        {
            try
            {
                using (var Reader = new StreamReader(Request.Body, Encoding.UTF8))
                {
                    var sb = new StringBuilder();

                    sb.AppendFormat("ContentType: {0}\n", Request.ContentType);
                    sb.AppendFormat("Request: {0}\n", Request.ToString());
                    sb.AppendFormat("ContentLength: {0}\n", Request.ContentLength.ToString());
                    if (Request.IsHttps)
                        sb.AppendFormat("{0}\n", "HTTPS!");

                    var headers = String.Empty;
                    foreach (var key in Request.Headers)
                        headers += key.Key + "=" + key.Value + Environment.NewLine;
                    sb.AppendFormat("Headers: \n{0}\n", headers);

                    sb.AppendFormat("QueryString: {0}\n", Request.QueryString);

                    var text = await Reader.ReadToEndAsync();
                    sb.AppendFormat("Body: {0}\n", text);
                    return Ok(sb.ToString());
                }
                return Ok("OK");
            }
            catch (System.Exception ex)
            {
                return Unauthorized($"{ex.Message}: {ex.StackTrace}");
            }
        }
    }

请求结果：

ContentType: application/json
Request: Microsoft.AspNetCore.Http.DefaultHttpRequest
ContentLength: 79
Headers: 
Accept=*/*
Accept-Encoding=gzip, deflate, br
Cache-Control=no-cache
Connection=keep-alive
Content-Length=79
Content-Type=application/json
Host=loja.online
User-Agent=PostmanRuntime/7.22.0
Postman-Token=121f1927-c340-492f-a98b-0d6586ff32d8

QueryString: 
Body: 

使用 POSTMAN 会发生同样的事情！

Answer 1

尝试指定来源：

    public async Task<ActionResult> Login([FromBody] LoginRequest request) //Added [FromBody]

Just for Further Details