https://source.dot.net/#Microsoft.AspNetCore.Http/Builder/ApplicationBuilder.cs,132
public class ApplicationBuilder : IApplicationBuilder {
private readonly List<Func<RequestDelegate, RequestDelegate>> _components = new();
...
public IApplicationBuilder Use(Func<RequestDelegate, RequestDelegate> middleware) {
_components.Add(middleware);
return this;
}
public RequestDelegate Build() {
RequestDelegate app = context => {
...
context.Response.StatusCode = StatusCodes.Status404NotFound;
return Task.CompletedTask;
}
}
for (var c = _components.Count - 1; c >= 0; c--) {
app = _components[c](app);
}
return app;
}
如您所見，RequestDelegateapp將始終被執行，這意味著狀態碼將設定為 404，這完全沒有意義。對我來說，代碼應該是這樣的：
public RequestDelegate Build() {
RequestDelegate app = context => {
...
if (context.Response has not been set) { // pesudo code
context.Response.StatusCode = StatusCodes.Status404NotFound;
}
return Task.CompletedTask;
}
}
uj5u.com熱心網友回復：
此代碼假定您已經添加了端點中間件：https : //github.com/aspnet/Routing/blob/master/src/Microsoft.AspNetCore.Routing/EndpointMiddleware.cs
// If we reach the end of the pipeline, but we have an endpoint, then something unexpected has happened.
// This could happen if user code sets an endpoint, but they forgot to add the UseEndpoint middleware.
在端點中間件中：
public async Task Invoke(HttpContext httpContext)
{
var endpoint = httpContext.Features.Get<IEndpointFeature>()?.Endpoint;
if (endpoint?.RequestDelegate != null)
{
Log.ExecutingEndpoint(_logger, endpoint);
try
{
await endpoint.RequestDelegate(httpContext);
}
finally
{
Log.ExecutedEndpoint(_logger, endpoint);
}
return;
}
await _next(httpContext);
}
因此，您共享的代碼處理了端點的不存在，從而回傳 404。
轉載請註明出處，本文鏈接：https://www.uj5u.com/gongcheng/406516.html
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