How to resolve StatusCode: 415, ReasonPhrase: 'Unsupported Media Type'?

Question

How do you post a file with HttpClient? It can't be that hard, can it?

I am posting a file from a Windows forms client to an ASP.Net Core 2.2 website API (not WebApi)

The file could be anything, word, pdf, image, video etc... The file could be anything up to 500MB and my JSON methods won't send anything above 25MB

No matter what I do I keep getting

StatusCode: 415, ReasonPhrase: 'Unsupported Media Type'

I can't work out what's gong wrong I have no idea what's missing. I've narrowed it down to this

            string filepath = file;
            string filename = Path.GetFileName(file);

            MultipartFormDataContent content = new MultipartFormDataContent();

            var fileContent = new StreamContent(File.OpenRead(filepath));

            fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data") { FileName = $"\"{filename}\"" };

            content.Add(fileContent);

            HttpResponseMessage response = await _httpClient.PostAsync(serviceMethod, content);

All the examples I've read (loads of them), most seem to be sensing JSON and I can do that in spades. The rest tell you what to read and look for but I'm still lost I just want to post a file. I have the server code ready to go.

    [HttpPost]
    public async Task<JsonResult> UploadFile([FromForm]IFormFile result)

I'll keep reading but any help would be much appreciated.

Ok, I got a bit closer. I've updated my code (see above) and now the controller on my API is getting invoked but now result is null

You've tried to use `[FromForm]` instead `[FromBody]` at method declaration? — catastrophic error, Apr 23 '20 at 18:39
Yep, just asking if you tested with `FromForm` instead. Thats how you usually receive an form-data post request. — catastrophic error, Apr 23 '20 at 18:50
@gcleite thanks for that I just tried it and updated my question. Got a bit closer but now a new problem — djack109, Apr 23 '20 at 18:54

score 1 · Accepted Answer · answered Apr 24 '20 at 10:13

Try to change your code as shown:

public async Task<IActionResult> PostFile()
{
        string filepath =file;
        string filename = Path.GetFileName(file);

        MultipartFormDataContent content = new MultipartFormDataContent();

        var fileContent = new StreamContent(System.IO.File.OpenRead(filepath));

        content.Add(fileContent, "result", filename);

        HttpResponseMessage response = await _httpClient.PostAsync(serviceMethod, content);
 }

    [HttpPost]
    public async Task<JsonResult> UploadFile(IFormFile result)

Result

Even though I'd already done `content.Add(fileContent, "result", filename);` that I'll mark you as an answer. Saves me writing up my own answer :) — djack109, Apr 24 '20 at 10:16

How to resolve StatusCode: 415, ReasonPhrase: 'Unsupported Media Type'?

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