邮递员在尝试使用表单数据执行 POST 时返回 415，但与 JSON 相同的请求工作正常

Question

I'm building a REST API and testing it out using Postman. I have an end-point which works fine when I test it by sending in raw json data, but I want to expand on this endpoint and allow it to take both json data and accept a file, so I wanted to test my current endpoint without any modifications, and see if I would get back the same result when I test my API using form-data instead of JSON, but it always throws a 415 exception.

On this picture I make a request with form-data.

And here I make the request to the same endpoint but with json data

Note that I have not added any customs headers when sending the requests, the (10) you see in the top is Temporary Headers. I also tried adding Content-Type: multipart/form-data, but got the same result.

Here's the code behind

PeopleController.cs

[HttpPost]
    public ActionResult<PersonDto> PostPerson(PersonForCreationDto person)
    {
        var personEntity = _mapper.Map<Entities.Person>(person); //Maps PersonForCreationDto to Entites.Person. This is possible because of the mapping in PeopleProfile.cs
        _personLibraryRepositry.AddPerson(personEntity);
        _personLibraryRepositry.Save();

        var personToReturn = _mapper.Map<PersonDto>(personEntity);

        return CreatedAtRoute("GetPerson",
            new { personId = personToReturn.PersonId },
            personToReturn);
    }

PersonForCreationDto

public class PersonForCreationDto
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Address { get; set; }
        public string ReasonsForBeingOnTheList { get; set; }

        public ICollection<PictureForCreationDto> Pictures { get; set; }
            = new List<PictureForCreationDto>();


    }

PersonLibraryRepository.cs

 public void AddPerson(Person person)
    {
       if (person == null)
        {
            throw new ArgumentNullException(nameof(person));
        }

        person.PersonId = Guid.NewGuid(); //API is responsibile for creating new IDS.

            foreach (var picture in person.Pictures)
            {
                picture.PictureId = Guid.NewGuid();

            }
        _context.People.Add(person);
    }

Answer 1

在您的表单数据中，将此添加到标题

Content-Type: application/json