引用 AspNetCoreRateLimit => StatusCode cannot be set because the response has already started.

app.UseIpRateLimiting(); #需要放在前面，否则抓去不准，还有可能会出现下列错误

本次出现这个错误，是因为  .Net Core 跨域

里面的这行：httpContext.Response.StatusCode = 204; 由于StatusCode 先给它设了 204，所以导致 IpRateLimit 报了下图的错误。

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

{

app.UseIpRateLimiting(); #需要放在前面

if (env.IsDevelopment())

{

app.UseDeveloperExceptionPage();

}

else

{

app.UseExceptionHandler("/Home/Error");

app.UseStatusCodePagesWithReExecute("/Home/Error");

}

//..............

}

app.UseIpRateLimiting(); #需要放在前面，否则抓去不准，还有可能会出现下列错误

fail: Microsoft.AspNetCore.Server.Kestrel[13]

Connection id "0HM084E4TPLBN", Request id "0HM084E4TPLBN:00000001": An unhandled exception was thrown by the application.

System.InvalidOperationException: StatusCode cannot be set because the response has already started.

at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ThrowResponseAlreadyStartedException(String value)

at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.set_StatusCode(Int32 value)

at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.Microsoft.AspNetCore.Http.Features.IHttpResponseFeature.set_StatusCode(Int32 value)

at Microsoft.AspNetCore.Http.DefaultHttpResponse.set_StatusCode(Int32 value)

at Microsoft.AspNetCore.Routing.Matching.HttpMethodMatcherPolicy.<>c__DisplayClass15_0.b__0(HttpContext context)

at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)

--- End of stack trace from previous location where exception was thrown ---

at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)

at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)

at AspNetCoreRateLimit.RateLimitMiddleware`1.Invoke(HttpContext context)

at Microsoft.AspNetCore.Diagnostics.StatusCodePagesMiddleware.Invoke(HttpContext context)

at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)

at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.HandleException(HttpContext context, ExceptionDispatchInfo edi)

at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)

at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)

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