[英]How to forward HTTP response to client
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。如何将 A 从 B 收到的响应返回给客户端这样 B 对 C 的使用对客户端是透明的。
例如,如果我使用HttpClient
从 A 向 B 发出请求,我如何在控制器的操作中将HttpResponseMessage
转发到客户端?
查看aspnet/AspLabs存储库,了解透明 HTTP 代理的一个很好的示例。 这个代理是一个中间件,处理客户端对 A 的请求并向 B 发出自己的请求。
为了提供完整的答案,这是其源代码中实际转发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);
}
有完整的代码将接收到的HttpResponseMessage
复制到存储库中的HttpContext.Response
。
我接受了 Iya 的回答并将其改编为 asp.net MVC 5
public async Task GetFile(CancellationToken cancellationToken)
{
var context = HttpContext;
var _httpClient = StaticHttpClient.Instance;
var requestMessage = new HttpRequestMessage()
{
RequestUri = new Uri("https://localhost:44305/api/files/123"),
};
using (var responseMessage = await _httpClient.SendAsync(
requestMessage, HttpCompletionOption.ResponseHeadersRead, cancellationToken))
{
Response.StatusCode = (int)responseMessage.StatusCode;
foreach (var header in responseMessage.Headers)
{
Response.Headers[header.Key] = header.Value.First();
}
foreach (var header in responseMessage.Content.Headers)
{
Response.Headers[header.Key] = header.Value.First();
}
Response.Headers.Remove("transfer-encoding");
//Response.BinaryWrite(await responseMessage.Content.ReadAsByteArrayAsync());
await responseMessage.Content.CopyToAsync(Response.OutputStream);
Response.Flush();
Response.Close();
context.ApplicationInstance.CompleteRequest();
}
}
这是一个服务器端:
WebForm1.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
HttpClient client = new HttpClient();
client.Timeout = TimeSpan.FromSeconds(10);
client.GetAsync("http://localhost:14388/WebForm2.aspx").ContinueWith(
getTask =>
{
if (getTask.IsCanceled)
{
Console.WriteLine("Request was canceled");
}
else if (getTask.IsFaulted)
{
Console.WriteLine("Request failed: {0}", getTask.Exception);
}
else
{
HttpResponseMessage response = getTask.Result;
string _message = response.Content.ReadAsStringAsync()
.Result
.Replace("\\", "")
.Trim(new char[1] { '"' });
}
});
}
WebForm2.aspx:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="Volkan.WebForm2" %>
WebForm2.aspx.cs:
protected void Page_Load(object sender, EventArgs e)
{
Response.Write("ahada cevabım");
}
这是一个客户端: https : //stackoverflow.com/a/38218387/2797185
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