[英].NET Core reverse proxy middleware and signalR
我需要在ASP.NET Core做一個反向代理中間件。 我有這樣的東西。 但它不適用於 SignalR。
反向代理的地址為 192.168.187.72:5000; SignalR 192.168.187.62:5000。 客戶端連接到代理,代理將 url 更改為 SignalR 集線器 url,但在客戶端我總是得到這個錯誤:
服務器在握手開始之前斷開連接
代碼:
public ReverseProxyMiddleware(RequestDelegate nextMiddleware,ILogger<ReverseProxyMiddleware> logger)
{
_nextMiddleware = nextMiddleware;
_logger = logger;
}
public async Task Invoke(HttpContext context)
{
var targetUri = BuildTargetUri(context.Request);
if (targetUri != null)
{
var targetRequestMessage = CreateTargetMessage(context, targetUri);
using (var responseMessage = await _httpClient.SendAsync(targetRequestMessage, HttpCompletionOption.ResponseHeadersRead, context.RequestAborted))
{
context.Response.StatusCode = (int)responseMessage.StatusCode;
CopyFromTargetResponseHeaders(context, responseMessage);
await responseMessage.Content.CopyToAsync(context.Response.Body);
}
return;
}
await _nextMiddleware(context);
}
private HttpRequestMessage CreateTargetMessage(HttpContext context, Uri targetUri)
{
var requestMessage = new HttpRequestMessage();
CopyFromOriginalRequestContentAndHeaders(context, requestMessage);
requestMessage.RequestUri = targetUri;
requestMessage.Headers.Host = targetUri.Host;
requestMessage.Method = GetMethod(context.Request.Method);
return requestMessage;
}
private void CopyFromOriginalRequestContentAndHeaders(HttpContext context, HttpRequestMessage requestMessage)
{
var requestMethod = context.Request.Method;
var streamContent = new StreamContent(context.Request.Body);
requestMessage.Content = streamContent;
foreach (var header in context.Request.Headers)
{
requestMessage.Content?.Headers.TryAddWithoutValidation(header.Key, header.Value.ToArray());
}
}
private void CopyFromTargetResponseHeaders(HttpContext context, HttpResponseMessage responseMessage)
{
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();
}
context.Response.Headers.Remove("transfer-encoding");
}
private static HttpMethod GetMethod(string method)
{
if (HttpMethods.IsDelete(method)) return HttpMethod.Delete;
if (HttpMethods.IsGet(method)) return HttpMethod.Get;
if (HttpMethods.IsHead(method)) return HttpMethod.Head;
if (HttpMethods.IsOptions(method)) return HttpMethod.Options;
if (HttpMethods.IsPost(method)) return HttpMethod.Post;
if (HttpMethods.IsPut(method)) return HttpMethod.Put;
if (HttpMethods.IsTrace(method)) return HttpMethod.Trace;
return new HttpMethod(method);
}
private Uri BuildTargetUri(HttpRequest request)
{
Uri targetUri = null;
StringValues clientId = string.Empty;
targetUri = new Uri($"http://192.168.187.62:5000{request.Path}{request.QueryString}");
_logger.LogInformation($"Request URL {request.Host + request.Path + request.QueryString} Target URL {targetUri.ToString()}");
return targetUri;
}
您確定要手動創建此類功能嗎?
有很多很棒的反向代理庫,Microsoft 有一個名為 YARP ( https://microsoft.github.io/reverse-proxy/ ) 的新項目,這是一個開源反向代理,據說具有高性能和高度可定制性。
如果您願意,我可以向您展示如何在 ASP.NET Core 應用程序中使用 yarp 的示例。
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