如何将HTTP响应转发到客户端 [英] How to forward HTTP response to client

问题描述

我有一个客户端(Xamarin)和两个Web API服务器A和B.客户端向A发出请求，A使用请求参数向B发出另一个请求.如何返回A从B收到的响应对客户来说，使得B对C的使用对客户是透明的.

I have a client (Xamarin) and two Web API servers, A and B. The client makes a request to A which uses the request parameters to make another request to B. How do I return the response that A receives from B to the client such that B's use of C is transparent to the client.

例如，如果我使用HttpClient从A到B发出请求，如何通过控制器的操作将HttpResponseMessage转发给客户端?

For example, if I make a request from A to B using HttpClient how do I forward the HttpResponseMessage to the client in a controller's action?

推荐答案

查看 aspnet/AspLabs 透明HTTP代理的一个很好的例子的存储库. 该代理是一个中间件，用于处理客户端对A的请求并向B进行自身的请求.

Look at aspnet/AspLabs repository for a good example of a transparent HTTP proxy. This proxy is a middleware handling client's requests to A and making its own requests to B.

要提供完整的答案，这是其源代码的一部分，实际上是转发HttpResponseMessage:

To provide a complete answer, this is the part of its source code which is actually forwarding a HttpResponseMessage:

using (var responseMessage = await _httpClient.SendAsync(
    requestMessage, HttpCompletionOption.ResponseHeadersRead, context.RequestAborted))
{
    context.Response.StatusCode = (int)responseMessage.StatusCode;
    foreach (var header in responseMessage.Headers)
    {
        context.Response.Headers[header.Key] = header.Value.ToArray();
    }

    foreach (var header in responseMessage.Content.Headers)
    {
        context.Response.Headers[header.Key] = header.Value.ToArray();
    }

    // SendAsync removes chunking from the response. This removes the header so it doesn't expect a chunked response.
    context.Response.Headers.Remove("transfer-encoding");
    await responseMessage.Content.CopyToAsync(context.Response.Body);
}

有完整代码将收到的HttpResponseMessage复制到存储库中的HttpContext.Response.

There is full code copying a received HttpResponseMessage to the HttpContext.Response in the repository.

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