Using C# HttpClient to POST File without multipart/form-data-CodePudding

I'm trying to interact with a API that doesn't support multipart/form-data for uploading a file.

I've been able to get this to work with the older WebClient but since it's being deprecated I wanted to utilize the newer HttpClient.

The code I have for WebClient that works with this end point looks like this:

            using (WebClient client = new WebClient())
            {
                byte[] file = File.ReadAllBytes(filePath);

                client.Headers.Add("Authorization", apiKey);
                client.Headers.Add("Content-Type", "application/pdf");
                byte[] rawResponse = client.UploadData(uploadURI.ToString(), file);
                string response = System.Text.Encoding.ASCII.GetString(rawResponse);

                JsonDocument doc = JsonDocument.Parse(response);
                return doc.RootElement.GetProperty("documentId").ToString();
            }

I've not found a way to get an equivalent upload to work with HttpClient since it seems to always use multipart.

CodePudding user response：

What speaks against using simply HttpClient's PostAsync method in conjunction with ByteArrayContent?

byte[] fileData = ...;

var payload = new ByteArrayContent(fileData);
payload.Headers.Add("Content-Type", "application/pdf");

myHttpClient.PostAsync(uploadURI, payload);

CodePudding user response：

I think it would look something like this

using var client = new HttpClient();

var file = File.ReadAllBytes(filePath);

var content = new ByteArrayContent(file);
content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");

var result = client.PostAsync(uploadURI.ToString(), content).Result;
result.EnsureSuccessStatusCode();

var response = await result.Content.ReadAsStringAsync();
var doc = JsonDocument.Parse(response);

return doc.RootElement.GetProperty("documentId").ToString();