How to add content header to Flurl - rest

Question

I would like to know how to add a content header to a flurl-statement.
The onedrive implementation requires me to add a content-type header to the content, and tried every possible solution with no luck.
I'm forced to use the regular httpclient with the following code.
Public Async Function UploadFile(folder As String, filepath As String) As Task(Of Boolean) Implements ICloud.UploadFile
Dim data As Byte() = File.ReadAllBytes(filepath)
Dim uploadurl As String = "drive/items/" + folder + ":/" + Path.GetFileName(filepath) + ":/" + "content?access_token=" + Token.access_token
Using client As New HttpClient()
client.BaseAddress = New Uri(ApiUrl)
Dim request As HttpRequestMessage = New HttpRequestMessage(HttpMethod.Put, uploadurl)
request.Content = New ByteArrayContent(data)
request.Content.Headers.Add("Content-Type", "application/octet-stream")
request.Content.Headers.Add("Content-Length", data.Length)
Dim response = Await client.SendAsync(request)
Return response.IsSuccessStatusCode
End Using
End Function
I already tried the regular PutJsonAsync method of Flurl, but with no luck.
It's the only non-flurl piece remaining in my code.
Thanx in advance.

Answer 1

The real issue here is that there's currently no out-of-the-box support for sending streams or byte arrays in Flurl. I plan to add some soon, but with the implementation details you already have it's easy to add this yourself with an extension method. (Forgive the C#, hopefully you can translate to VB.)
public static Task<HttpResponseMessage> PutFileAsync(this FlurlClient client, string filepath)
{
var data = File.ReadAllBytes(filepath);
var content = new ByteArrayContent(data);
content.Headers.Add("Content-Type", "application/octet-stream");
content.Headers.Add("Content-Length", data.Length);
return client.SendAsync(HttpMethod.Put, content: content);
}
The above works if you already have a FlurlClient, but as the docs describe it's a good idea to have corresponding string and Url extensions, which can just delegate to the above method:
public static Task<HttpResponseMessage> PutFileAsync(this Url url, string filepath)
{
return new FlurlClient(url).PutFileAsync(filepath);
}
public static Task<HttpResponseMessage> PutFileAsync(this string url, string filepath)
{
return new FlurlClient(url).PutFileAsync(filepath);
}
Tuck those away in a static helper class and they should work seamlessly with Flurl:
await uploadurl.PutFileAsync(filepath)