Error Page gives out an empty response instead of displaying that something went wrong about diagnostics HOT 18 CLOSED

What do you actually get back?

There are some types of errors that it cannot handle, especially errors that occur after the response headers have been sent. In these cases it usually throws an exception trying to display the error page because the response is not in a state that will allow it. Listening for first-chance exceptions in the debugger will always be more reliable.

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When triggering an exception in an MVC action (catchable with action filters) and error page options being all on I get an empty response. I am running on mono with the nowin server.

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Can you repro the issue on .NET 4.5 or CoreCLR, using Helios or WebListener?

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I do not personally have access to Windows right now. However I have heard that this issue happens only on Mono (it is why I have observed it).

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What response status code and headers do you get back?

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I get an HTTP 500 i.e. Internal Server Error. There is only one header "Content-Length: 0". This is with all ErrorPageOptions turned on.

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Does this sample work for you?
https://github.com/aspnet/Diagnostics/blob/dev/samples/ErrorPageSample/Startup.cs

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The same result as before is obtained ie. A content length of 0 with status code 500.

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Ok, one more thing: Try running Kestrel on Mono.

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Last time I checked it does not work on Linux(it is what I have).

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Kestrel is supposed to work on Mono at the moment.

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On both OSX and Linux.

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Kestrel loads a Mac specific binary on all Unix style operating systems. That will blow up on linux. mac binaries are not linux binaries. Kestrel needs to let Linux load libuv from the system directories. I tried to file an issue but it fell on deaf ears.

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After installing libuv..running kestrel yields:

System.NullReferenceException: Object reference not set to an instance of an object
  at Microsoft.AspNet.Server.Kestrel.Networking.Libuv.loop_size () [0x00000] in <filename unknown>:0 
  at Microsoft.AspNet.Server.Kestrel.Networking.UvLoopHandle.Init (Microsoft.AspNet.Server.Kestrel.Networking.Libuv uv) [0x00000] in <filename unknown>:0 
  at Microsoft.AspNet.Server.Kestrel.KestrelThread.ThreadStart (System.Object parameter) [0x00000] in <filename unknown>:0 

So it does not work on Linux as some advertise

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Same problem ubuntu 14.04, hope they decide to listen:

System.NullReferenceException: Object reference not set to an instance of an object
at Microsoft.AspNet.Server.Kestrel.Networking.Libuv.loop_size () [0x00000] in :0
at Microsoft.AspNet.Server.Kestrel.Networking.UvLoopHandle.Init (Microsoft.AspNet.Server.Kestrel.Networking.Libuv uv) [0x00000] in :0
at Microsoft.AspNet.Server.Kestrel.KestrelThread.ThreadStart (System.Object parameter) [0x00000] in :0

from diagnostics.

I assume your were talking about this part:

if (Libuv.IsWindows)
{
var architecture = IntPtr.Size == 4
? "x86"
: "amd64";
libraryPath = Path.Combine(
libraryPath,
"native",
"windows",
architecture,
"libuv.dll");
}
else
{
libraryPath = Path.Combine(
libraryPath,
"native",
"darwin",
"universal",
"libuv.dylib");
}

from diagnostics.

I got Kestrel to load using the solution found on this page: http://carolynvanslyck.com/blog/2014/09/dotnet-vnext-impressions/

from diagnostics.

This issue was fixed in Error page on mono long back. This can be closed.

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