c＃Web API - 将文件上载重新发布到后端服务

Question

我尝试将文件上传请求从一个Web API服务重新发布到另一个后端API服务。

代码类似于：

// exposed public API:

[HttpPost]

public async Task<HttpResponseMessage> UploadImage()
{

            var client = new HttpClient();
            HttpResponseMessage response = await client.PostAsync(backendAddress + "api/file/upload",
                Request.Content  // this is the incoming HttpRequestMessage.Content which appears intact with the file
            );


        // throws a 500 error before getting to the backend service


...

// private backend API

[HttpPost]
public async Task<HttpResponseMessage> UploadImage()
{
    try
    {
        var provider = new MultipartMemoryStreamProvider();

        await Request.Content.ReadAsMultipartAsync(provider);

...

我这样做的原因是前端框与客户端通信，后端框写入数据库。