如何将HttpRequestMessage转发到另一台服务器

Question

将http web api请求转发到另一台服务器的最佳方法是什么？

这是我正在尝试的:

我有一个.NET项目,当我得到某些API请求时,我想修改请求,将其转发到另一台服务器,并返回第二台服务器发送的响应.

我正在做以下事情:

[Route("forward/{*api}")]
public HttpResponseMessage GetRequest(HttpRequestMessage request)
{
    string redirectUri = "http://productsapi.azurewebsites.net/api/products/2";
    HttpRequestMessage forwardRequest = request.Clone(redirectUri);

    HttpClient client = new HttpClient();
    Task<HttpResponseMessage> response = client.SendAsync(forwardRequest);
    Task.WaitAll(new Task[] { response } );
    HttpResponseMessage result = response.Result;

    return result;
}

克隆方法定义为:

public static HttpRequestMessage Clone(this HttpRequestMessage req, string newUri)
{
    HttpRequestMessage clone = new HttpRequestMessage(req.Method, newUri);

    if (req.Method != HttpMethod.Get)
    {
        clone.Content = req.Content;
    }
    clone.Version = req.Version;

    foreach (KeyValuePair<string, object> prop in req.Properties)
    {
        clone.Properties.Add(prop);
    }

    foreach (KeyValuePair<string, IEnumerable<string>> header in req.Headers)
    {
        clone.Headers.TryAddWithoutValidation(header.Key, header.Value);
    }

    return clone;
}

但是,出于某种原因,我没有将url重定向到指定的redirectUri,而是将RequestMessage.RequestUri设置为404响应http://localhost:61833/api/products/2.(http://localhost:61833是原始请求uri的根).

谢谢

Answer 1

您可能需要在克隆实例上显式设置主机头.否则,您只是将原始请求的主机头值复制到克隆.

即将以下行添加到克隆方法的末尾:

clone.Headers.Host = new Uri(newUri).Authority;

此外,根据您在此处尝试实现的目标,您可能还需要处理其他问题,例如请求中的cookie域与您要转发的新域不匹配,以及在返回的任何响应cookie上设置正确的域.