RickStrahl
commented
5 years ago Thanks for catching this. Checked the code and I accidentally had the pass through code using ResponseBody.Write() instead of Response.Body.WriteAsync(). Code doesn't need to be sync, so updated and hopefully that will fix it.
e745b11d7d5064b086346884850a51e66a511df7
Haven't tested on 3.0 yet... will try that later tonight.
Swellenator
Using .NET Core 3 Preview 5, (blazor server side). I get an exception saying
Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead.Full stack trace:
info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[0] User profile is available. Using 'C:\Users\[user]\AppData\Local\ASP.NET\DataProtection-Keys' as key repository and Windows DPAPI to encrypt keys at rest. info: Microsoft.Hosting.Lifetime[0] Now listening on: http://localhost:4698 info: Microsoft.Hosting.Lifetime[0] Application started. Press Ctrl+C to shut down. info: Microsoft.Hosting.Lifetime[0] Hosting environment: Development info: Microsoft.Hosting.Lifetime[0] Content root path: c:\[projectfolder] info: Microsoft.AspNetCore.Hosting.Diagnostics[1] Request starting HTTP/1.1 GET http://localhost:4698/[page] warn: Microsoft.AspNetCore.HttpsPolicy.HttpsRedirectionMiddleware[3] Failed to determine the https port for redirect. info: Microsoft.AspNetCore.Routing.EndpointMiddleware[0] Executing endpoint '/_Host' info: Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker[3] Route matched with {page = "/_Host"}. Executing page /_Host info: Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker[103] Executing an implicit handler method - ModelState is Valid info: Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker[104] Executed an implicit handler method, returned result Microsoft.AspNetCore.Mvc.RazorPages.PageResult. info: Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker[4] Executed page /_Host in 225.16230000000002ms info: Microsoft.AspNetCore.Routing.EndpointMiddleware[1] Executed endpoint '/_Host' info: Microsoft.AspNetCore.Hosting.Diagnostics[2] Request finished in 434.31940000000003ms 200 text/html; charset=utf-8 info: Microsoft.AspNetCore.Hosting.Diagnostics[1] Request starting HTTP/1.1 GET http://localhost:4698/_framework/blazor.server.js info: Microsoft.AspNetCore.Hosting.Diagnostics[1] Request starting HTTP/1.1 GET http://localhost:4698/css/main.css info: Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware[6] The file /css/main.css was not modified info: Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware[6] The file /assets/img/header-logo-agov.png was not modified info: Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware[6] The file /_framework/blazor.server.js was not modified info: Microsoft.AspNetCore.Hosting.Diagnostics[1] Request starting HTTP/1.1 GET http://localhost:4698/js/script.min.js info: Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware[6] The file /js/script.min.js was not modified fail: Microsoft.AspNetCore.Server.Kestrel[13] Connection id "0HLN315URIMHG", Request id "0HLN315URIMHG:00000001": An unhandled exception was thrown by the application. System.InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead. at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseStream.Write(Byte[] buffer, Int32 offset, Int32 count) at System.IO.Stream.Write(ReadOnlySpan1 buffer) at Westwind.AspNetCore.LiveReload.LiveReloadMiddleware.InvokeAsync(HttpContext context) at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication1 application) fail: Microsoft.AspNetCore.Server.Kestrel[13] Connection id "0HLN315URIMHH", Request id "0HLN315URIMHH:00000001": An unhandled exception was thrown by the application. System.InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead. at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseStream.Write(Byte[] buffer, Int32 offset, Int32 count) at System.IO.Stream.Write(ReadOnlySpan1 buffer) at Westwind.AspNetCore.LiveReload.LiveReloadMiddleware.InvokeAsync(HttpContext context) at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication1 application) info: Microsoft.AspNetCore.Hosting.Diagnostics[2] Request finished in 228.88060000000002ms 500 info: Microsoft.AspNetCore.Hosting.Diagnostics[2] Request finished in 232.1809ms 500 fail: Microsoft.AspNetCore.Server.Kestrel[13] Connection id "0HLN315URIMHF", Request id "0HLN315URIMHF:00000002": An unhandled exception was thrown by the application. System.InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead. at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseStream.Write(Byte[] buffer, Int32 offset, Int32 count) at System.IO.Stream.Write(ReadOnlySpan1 buffer) at Westwind.AspNetCore.LiveReload.LiveReloadMiddleware.InvokeAsync(HttpContext context) at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication1 application) info: Microsoft.AspNetCore.Hosting.Diagnostics[2] Request finished in 212.89960000000002ms 500 fail: Microsoft.AspNetCore.Server.Kestrel[13] Connection id "0HLN315URIMHI", Request id "0HLN315URIMHI:00000001": An unhandled exception was thrown by the application. System.InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead. at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseStream.Write(Byte[] buffer, Int32 offset, Int32 count) at System.IO.Stream.Write(ReadOnlySpan1 buffer) at Westwind.AspNetCore.LiveReload.LiveReloadMiddleware.InvokeAsync(HttpContext context) at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication1 application) info: Microsoft.AspNetCore.Hosting.Diagnostics[2] Request finished in 196.69070000000002ms 500 info: Microsoft.AspNetCore.Hosting.Diagnostics[1] Request starting HTTP/1.1 GET http://localhost:4698/js/script.min.js info: Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware[2] Sending file. Request path: '/js/script.min.js'. Physical path: 'c:\[projectfolder]\wwwroot\js\script.min.js' fail: Microsoft.AspNetCore.Server.Kestrel[13] Connection id "0HLN315URIMHI", Request id "0HLN315URIMHI:00000002": An unhandled exception was thrown by the application. System.InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead. at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseStream.Write(Byte[] buffer, Int32 offset, Int32 count) at System.IO.Stream.Write(ReadOnlySpan1 buffer) at Westwind.AspNetCore.LiveReload.LiveReloadMiddleware.InvokeAsync(HttpContext context) at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication1 application) info: Microsoft.AspNetCore.Hosting.Diagnostics[2] Request finished in 9.5952ms 500 info: Microsoft.AspNetCore.Hosting.Diagnostics[1] Request starting HTTP/1.1 GET http://localhost:4698/__livereloadIs that intended. I 'fixed' it by adding this to the
CreateHostBuildermethod:webBuilder.ConfigureKestrel((context, options) => { options.AllowSynchronousIO = true; });I think it might be different in .NET Core 3. Maybe something should be added to the readme?
Cheers