All,

I am getting the following exception when I try call my web api (.net 6) end point using postman (I tried content type: form-data/application/x-www-form-urlencoded and I did include user, pwd parameters in the body, post url: http://localhost:5000/api/auth):

  {StatusCode: 415, ReasonPhrase: 'Unsupported Media Type', Version: 1.1, Content: System.Net.Http.HttpConnectionResponseContent, Headers:
{
  Date: Thu, 17 Mar 2022 18:12:40 GMT
  Server: Kestrel
  Transfer-Encoding: chunked
  Content-Type: application/problem json; charset=utf-8
}}

Here's my web api controller:

[ApiController]
    [Route("/api/[controller]")]
    public class AuthController : ControllerBase
    {

        private readonly ILogger<AuthController> _logger;

        public AuthController(ILogger<AuthController> logger)
        {
            _logger = logger;
        }

        [HttpPost()]
        public string GetToken([FromBody] AuthCredentials cred)
        {
            _logger.LogInformation($"{nameof(AuthController)} => Received user: {cred.User}");
            _logger.LogInformation($"{nameof(AuthController)} => Received pwd: {cred.Pwd}");
            return "token:12345";
        }
    }

It worked before, when I was passing user/pwd as separate fields, the minute I put [FromBody] it stopped working and I started getting this exception.

public class AuthCredentials
    {
        public string User { get; set; }
        public string Pwd { get; set; }
    }

I do use SignalR Webapis, here's my Startup.cs

public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers(); // only for web api controllers

            services.AddSignalR()
                .AddHubOptions<ServerHub>(options =>
                {
                    options.EnableDetailedErrors = true;
                    options.MaximumReceiveMessageSize = null; // null is unlimited
                })
                // add message pack, requires nuget: Microsoft.AspNetCore.SignalR.Protocols.MessagePack (you must be on .net6 to use this nuget)
                .AddMessagePackProtocol(); 
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapGet("/", async context =>
                {
                    await context.Response.WriteAsync("Running SignalR hub, at url: /server");
                });

                endpoints.MapHub<ServerHub>("/server", options =>
                {
                    options.Transports = HttpTransportType.WebSockets;
                
                });

                endpoints.MapControllers(); // only for api controllers

            });
        }
    }

**

• UPDATE: Fixed the Unsupported Media Type

** I was able to fix the Unsupported Media Type exception by changing this line and adding form data content-type:

services
                .AddControllers(options =>
                {
                    var jsonInputFormatter = options.InputFormatters
                        .OfType<Microsoft.AspNetCore.Mvc.Formatters.SystemTextJsonInputFormatter>()
                        .Single();
                    jsonInputFormatter.SupportedMediaTypes
                        .Add("application/x-www-form-urlencoded");
                }); 

But now, when I run post man I get 400, bad request exception:

{
    "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
    "title": "One or more validation errors occurred.",
    "status": 400,
    "traceId": "00-46970e65eec389a5d6d355d960823e57-dd8db1776ac7f90c-00",
    "errors": {
        "$": [
            "The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. Path: $ | LineNumber: 0 | BytePositionInLine: 0."
        ]
    }
}

Q: How can I pass in using form Data (user, pwd), and populate AuthCredentials object on the server?

CodePudding user response：

if you trying to call this action from postman

 [HttpPost()]
public string GetToken([FromBody] AuthCredentials cred)

 _logger.LogInformation($"{nameof(AuthController)} => Received user: {cred.User}");
 _logger.LogInformation($"{nameof(AuthController)} => Received pwd: {cred.Pwd}");
 return "token:12345";
}

you need to select body=>raw=>json options in postmant and add your data as

{
  "user": "user",
  "pwd" : "pwd"
}

and remove all extra code you added to AddController config. It is only confusing and probably will cause more problems in the future

CodePudding user response：

The reason why it's doesn't work, is that you are trying to retrieve parameter from the URL, but you are using [FromBody] which is supposed to use the body of your request to send parameters .

Try to send your parameters as shown below