OpenAPI 3.0.1 upload/download file example

Do you have an example of what an ASP.Net Core 3.0 API operation that uploads and downloads a file and what the OpenAPI 3.0.1 yaml should look like in order to properly generate a client using NSwag code generator?

I’ve tried every combination I can think of, and nothing seems to work. Either I get errors trying to deserialize to a FileContent type, or I get errors about not finding the Content boundary or else the client has random parameters that aren’t used or a myriad of other issues. At this point, my yaml is identical to what’s on the OpenApi documentation page, but this doesn’t work, either: https://swagger.io/docs/specification/describing-request-body/file-upload/ I just need a working example to go off of so I can stop guessing.

[dtaalbers]

On your client side, if you would replace the FileParameter/Blob into FormData and send the file as below, the IFormFile would get filled in.

const formData = new FormData();
formData.append('file', fileObj)

Are you suggesting this to me? If so, thanks for the reply! But I know that the client needs to have FormData. But I don’t want to do that manually every time after I generate the client. The trick is to get nswag to do that. But the solution that I used for dotnet core 2.x and 4.x swashbuckle, doesn’t work for dotnet core 3.x and swashbuckle 5.x.

[dellel-firas]

Hello, I had exactly the same issue, so I did like @mahinthan suggested, but it was not enough, in the request I got payload instead of formData, so the missing part of the solution is to delete the content type which have this value “multipart/form-data” from the generated code and it worked well "Content-Type": "multipart/form-data" But it’s not really practice to change manually a generated code, that’s why I added some code to the useTransformOptionsMethod remove the content type when it is equal to “multipart/form-data” Hope that it helps, and that will be fixed soon.