Value cannot be null. stringToEscape

[wakawajaszi]

Hello,

I'm getting this error:

System.ArgumentNullException: Value cannot be null.
Parameter name: stringToEscape
   at System.Uri.EscapeDataString(String stringToEscape)
   at Microsoft.AspNetCore.Http.Internal.ResponseCookies.Append(String key, String value, CookieOptions options)
   at ReturnTrue.AspNetCore.Identity.Anonymous.AnonymousIdMiddleware.HandleRequest(HttpContext httpContext)
   at ReturnTrue.AspNetCore.Identity.Anonymous.AnonymousIdMiddleware.<Invoke>d__3.MoveNext()

This error occurs after the number of second I set up in AnonymousIdCookieOptionsBuilder -> SetCustomCookieTimeout

It looks like the code in AnonymousIdMiddleware on lines 86-98 doesn't work properly (maybe something wrong with bool SlidingExpiration value ) and can't attach a new cookie.

[Patryk]

Hi,

I'm getting exactly the same error. Do you find any solution for it?

[Alessandro Riperi]

Currently trying to reproduce it... what version of Asp.NET Core are you on?

[wakawajaszi]

Hi,
.net Core version is 2.1.4.
Try set SetCustomCookieTimeout to 120 and You should get error after 2 minutes.

[Patryk]

I found what is a problem and I have solution.
Problem:
Expire time is set once at start application and later never be updated.
Solution:
In the section where you recreate new id for anonymousId I was add
cookieOptions.Expires = DateTime.UtcNow.AddSeconds(cookieOptions.Timeout);
and after that problem was disappear.

[Alessandro Riperi]

You were right... startup should contain only configuration options and not calculated ones. Moved the other into the middleware and should now be working!

Thanks for your feedback!

[Patryk]

I think you should add this code between 84 and 85 line. Now, every request calculate new expire date.

[Alessandro Riperi]

Sliding expiration is enabled by default, but you can disable it by using CookieOptions!