可以使用Web API配置HTTP代理吗?
我想构建一个HTTP代理,将所有请求路由到另一个HTTP服务。关于如何使用Web API实现这一点,有人有什么好的建议吗可以使用Web API配置HTTP代理吗?,http,.net-4.0,asp.net-web-api,Http,.net 4.0,Asp.net Web Api,我想构建一个HTTP代理,将所有请求路由到另一个HTTP服务。关于如何使用Web API实现这一点,有人有什么好的建议吗 我的情况是,我们有两组服务。一个是外部可访问的,另一个不是。我想从外部服务提供一个路由器,在所有逻辑和配置所在的地方调用我的内部服务。是的,这很容易做到。只需创建一个从DelegatingHandler派生的类,重写SendAsync并将其添加到配置对象上的MessageHandlers集合中 这里是我创建的一个自托管控制台应用程序代理,它将JSON转换为XML,反之亦然。它
我的情况是,我们有两组服务。一个是外部可访问的,另一个不是。我想从外部服务提供一个路由器,在所有逻辑和配置所在的地方调用我的内部服务。是的,这很容易做到。只需创建一个从DelegatingHandler派生的类,重写SendAsync并将其添加到配置对象上的MessageHandlers集合中 这里是我创建的一个自托管控制台应用程序代理,它将JSON转换为XML,反之亦然。它应该让你知道如何做
class Program
{
static void Main(string[] args)
{
var config = new HttpSelfHostConfiguration("http://localhost:8081");
var server = new HttpSelfHostServer(config);
var originServerUri = new Uri("http://example.org/origin-server/");
config.MessageHandlers.Add(new Converter(originServerUri));
server.OpenAsync().Wait();
Console.Read();
server.CloseAsync().Wait();
}
}
public class Converter : DelegatingHandler
{
private HttpClient _HttpClient = new HttpClient();
private Uri _OriginServer;
public Converter(Uri originServer)
{
_OriginServer = originServer;
}
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
{
Console.WriteLine(new HttpMessageContent(request).ReadAsStringAsync().Result);
var newRequest = CreateNewRequest(request);
var t = _HttpClient.SendAsync(newRequest);
await t;
if (t.IsCompleted)
{
try
{
var response = CreateNewResponse(t.Result);
Console.WriteLine("--->");
Console.WriteLine(new HttpMessageContent(response).ReadAsStringAsync().Result);
return response;
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return new HttpResponseMessage(HttpStatusCode.InternalServerError) { Content = new StringContent(ex.Message)};
}
}
else
{
return new HttpResponseMessage(HttpStatusCode.InternalServerError) { Content = new StringContent(t.Exception.Message)};
}
}
private HttpRequestMessage CreateNewRequest(HttpRequestMessage request)
{
var newRequest = new HttpRequestMessage();
newRequest.Headers.Clear();
foreach (var header in request.Headers)
{
newRequest.Headers.Add(header.Key, header.Value);
}
if (request.Content.Headers.ContentLength != 0)
{
newRequest.Content = TranslateContent(request.Content);
}
newRequest.Headers.Host = null;
newRequest.Method = request.Method;
newRequest.RequestUri = new Uri(_OriginServer, request.RequestUri.PathAndQuery);
return newRequest;
}
private HttpResponseMessage CreateNewResponse(HttpResponseMessage response)
{
response.Content = TranslateContent(response.Content);
return response;
}
private HttpContent TranslateContent(HttpContent httpContent)
{
var mediatype = httpContent.Headers.ContentType.MediaType;
if (mediatype.Contains("+xml"))
{
return TranslateXmlToJson(httpContent);
}
else
{
return TranslateJsonToXml(httpContent);
}
}
private HttpContent TranslateJsonToXml(HttpContent content)
{
var mediatype = content.Headers.ContentType.MediaType;
string json = content.ReadAsStringAsync().Result;
XmlDocument doc = (XmlDocument)JsonConvert.DeserializeXmlNode(json);
return new StringContent(doc.OuterXml, Encoding.UTF8, mediatype.Replace("+json", "+xml"));
}
private HttpContent TranslateXmlToJson(HttpContent content)
{
var mediatype = content.Headers.ContentType.MediaType;
XmlDocument doc = new XmlDocument();
doc.Load(content.ReadAsStreamAsync().Result);
string jsonText = JsonConvert.SerializeXmlNode(doc);
return new StringContent(jsonText, Encoding.UTF8, mediatype.Replace("+xml", "+json"));
}
}
类程序
{
静态void Main(字符串[]参数)
{
var config=新的HttpSelfHostConfiguration(“http://localhost:8081");
var server=新的HttpSelfHostServer(配置);
var originServerUri=新Uri(“http://example.org/origin-server/");
Add(新转换器(originServerUri));
server.OpenAsync().Wait();
Console.Read();
server.CloseAsync().Wait();
}
}
公共类转换器:DelegatingHandler
{
私有HttpClient _HttpClient=新HttpClient();
私有Uri_OriginServer;
公共转换器(Uri原始服务器)
{
_OriginServer=OriginServer;
}
受保护的重写异步任务SendAsync(HttpRequestMessage请求,System.Threading.CancellationToken CancellationToken)
{
WriteLine(新的HttpMessageContent(request.ReadAsStringAsync().Result);
var newRequest=CreateNewRequest(请求);
var t=_HttpClient.SendAsync(newRequest);
等待t;
如果(t.已完成)
{
尝试
{
var response=CreateNewResponse(t.Result);
Console.WriteLine(“-->”);
WriteLine(新的HttpMessageContent(response.ReadAsStringAsync().Result);
返回响应;
}
捕获(例外情况除外)
{
控制台写入线(例如消息);
返回新的HttpResponseMessage(HttpStatusCode.InternalServerError){Content=newStringContent(ex.Message)};
}
}
其他的
{
返回新的HttpResponseMessage(HttpStatusCode.InternalServerError){Content=newStringContent(t.Exception.Message)};
}
}
私有HttpRequestMessage CreateNewRequest(HttpRequestMessage请求)
{
var newRequest=newhttprequestmessage();
newRequest.Headers.Clear();
foreach(request.Headers中的var头)
{
newRequest.Headers.Add(header.Key,header.Value);
}
if(request.Content.Headers.ContentLength!=0)
{
newRequest.Content=TranslateContent(request.Content);
}
newRequest.Headers.Host=null;
newRequest.Method=request.Method;
newRequest.RequestUri=新Uri(_OriginServer,request.RequestUri.PathAndQuery);
返回新请求;
}
专用HttpResponseMessage CreateNewResponse(HttpResponseMessage响应)
{
response.Content=TranslateContent(response.Content);
返回响应;
}
私有HttpContent TranslateContent(HttpContent-HttpContent)
{
var mediatype=httpContent.Headers.ContentType.mediatype;
if(mediatype.Contains(“+xml”))
{
返回TranslateXmlToJson(httpContent);
}
其他的
{
返回TranslateJsonToXml(httpContent);
}
}
私有HttpContent TranslateJsonToXml(HttpContent内容)
{
var mediatype=content.Headers.ContentType.mediatype;
字符串json=content.ReadAsStringAsync().Result;
XmlDocument doc=(XmlDocument)JsonConvert.DeserializeXmlNode(json);
返回新的StringContent(doc.OuterXml、Encoding.UTF8、mediatype.Replace(“+json”、“+xml”);
}
私有HttpContent TranslateXmlToJson(HttpContent内容)
{
var mediatype=content.Headers.ContentType.mediatype;
XmlDocument doc=新的XmlDocument();
doc.Load(content.ReadAsStreamAsync().Result);
字符串jsonText=JsonConvert.SerializeXmlNode(doc);
返回新的StringContent(jsonText,Encoding.UTF8,mediatype.Replace(“+xml”,“+json”);
}
}
感谢各位的回复。最后,我决定使用IHttpHandler,因为需要代理的服务目前没有使用webapi。这是通过以下方式实现的:
public class MyProxy : IHttpHandler
{
private static readonly string CoreServicesUrl = "localhost:1234";
public void ProcessRequest(HttpContext context)
{
string serviceUrl = context.Request.Headers.Get("ServiceUrl");
if (serviceUrl == null)
{
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
return;
}
string url = string.Format("http://{0}/api/{1}", CoreServicesUrl, serviceUrl);
HttpResponseMessage response = RouteRequest(context, url);
// This will handle both successful and unsuccessful responses
context.Response.StatusCode = (int)response.StatusCode;
var content = response.Content.ReadAsStringAsync().Result;
context.Response.Write(content);
}
private static HttpResponseMessage RouteRequest(HttpContext context, string url)
{
var client = new HttpClient();
if (context.Request.HttpMethod == "GET")
return client.GetAsync(url).Result;
if (context.Request.HttpMethod == "POST")
{
var stream = context.Request.GetBufferlessInputStream();
var sr = new StreamReader(stream);
var body = sr.ReadToEnd();
try
{
return client.PostAsync(url, new StringContent(body, Encoding.UTF8, "application/json")).Result;
}
catch (Exception ex)
{
var response = new HttpResponseMessage(HttpStatusCode.InternalServerError) {ReasonPhrase = ex.Message};
return response;
}
}
// Other HTTP verbs are not supported
return new HttpResponseMessage(HttpStatusCode.NotImplemented);
}
public bool IsReusable
{
get
{
return false;
}
}
}
需要在发送请求的客户端上配置DelegatingHandler,对吗?我需要在服务器端设置此设置。如果我不能使用它,我想我可以随时检查HttpRequest并手动重新定向。@crankage否在这种情况下,您将在服务器上使用委派处理程序。您确定不只是想使用广泛可用且具有良好社区支持的程序吗,