向其他人提供一个Web API转发请求的最佳方法

Question

我有一些Web服务在不同的服务器上运行,我希望有一个Web服务在其余的"前面"运行,以决定应该根据标头值转发请求的Web服务(服务器).

这个想法是客户会发送请求,比如说:

http://api.mysite.com/cars

mysite.com上的API将检查请求,从API密钥中提取信息(在标头中提供)并重定向到适当的服务器,例如

http://server4.mysite.com/api/cars

这会起作用吗？我担心如何将响应(w/data)从"server4"返回给客户端.响应是仅返回给第一台服务器还是客户端实现响应？

Answer 1

您需要做的就是构建一个Web API DelegatingHandler,如下所示:

public class ProxyHandler : DelegatingHandler
{
  protected override async System.Threading.Tasks.Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
  {
    UriBuilder forwardUri = new UriBuilder(request.RequestUri);
    //strip off the proxy port and replace with an Http port
    forwardUri.Port = 80;
    //send it on to the requested URL
    request.RequestUri = forwardUri.Uri;
    HttpClient client = new HttpClient();
    var response = await  client.SendAsync(request,HttpCompletionOption.ResponseHeadersRead);
    return response;
  }
} 

Answer 2

只是遇到同样的任务,除了Yazan Ati的答案之外还要添加更多的一行.

    [HttpPost]
    [HttpGet]
    [Route("api/TestBot/{*remaining}")]
    public Task<HttpResponseMessage> SendMessage()
    {
        const string host = "facebook.botframework.com";
        string forwardUri = $"https://{host}/api/v1/bots/billycom{Request.RequestUri.Query}";

        Request.Headers.Remove("Host");
        Request.RequestUri = new Uri(forwardUri);
        if (Request.Method == HttpMethod.Get)
        {
            Request.Content = null;
        }

        var client = new HttpClient();
        return client.SendAsync(Request, HttpCompletionOption.ResponseHeadersRead);
    }