whatson_server_upload.cs

// Receiving database files from clients via http request
        [ParameterRoute(HttpMethod.PUT, "/server/uploadFile/{fileName}")]
        public static async Task GetFile(HttpContext ctx)
        {
            try
            {
                // Url data
                string fileName = ctx.Request.Url.Parameters["fileName"];

                // Variabels
                string path = "C:\Files\"

                // Checking whether the data is chunked or not
                if (ctx.Request.ChunkedTransfer)
                {
                    // load chuncked data
                    bool finalChunk = false;
                    var dataBuffer = new List<byte>();
                    while (!finalChunk)
                    {
                        Chunk chunk = await ctx.Request.ReadChunk();
                        try
                        {
                            dataBuffer.AddRange(chunk.Data);
                        }
                        catch (Exception ex) { throw ex; }
                        finalChunk = chunk.IsFinalChunk;
                    }
                    // save all buffers into a file
                    File.WriteAllBytes(path, dataBuffer.ToArray());
                }
                else
                {
                    using (var dataStream = ctx.Request.Data)
                    {
                        // read data stream 
                        var dataBuffer = await dataStream.ReadToEndAsync();

                        try
                        {
                            // Saving the data read from the Stream
                            File.WriteAllBytes(path, dataBuffer.ToArray());
                            if (!File.Exists(path))
                            {
                                throw new Exception("the file wasn't recived.")
                            }
                        }
                        catch (Exception ex) { throw ex; }
                    }
                }
                await ctx.Response.Send("the file with was recived.");
                ctx.Response.StatusCode = 204;

            }
            catch (Exception ex)
            {
                await ctx.Response.Send("500 --===>" + ex.Message);
                ctx.Response.StatusCode = 500;
            }

        }