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Update http-context.md (#22698) 

* Update http-context.md

* Update aspnetcore/fundamentals/http-context.md

* Update http-context.md

* Update http-context.md

* Update aspnetcore/fundamentals/http-context.md

* Update aspnetcore/fundamentals/http-context.md

Co-authored-by: Kirk Larkin <serpent5@pm.me>

Co-authored-by: Kirk Larkin <serpent5@pm.me>
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Rick Anderson 2021-07-29 13:10:05 -07:00 committed by GitHub
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@ -1,7 +1,7 @@
---
title: Access HttpContext in ASP.NET Core
author: coderandhiker
description: Learn how to access HttpContext in ASP.NET Core.
description: HttpContext in ASP.NET Core. HttpContext is not thread-safe and can throw NullReferenceException.
monikerRange: '>= aspnetcore-2.1'
ms.author: riande
ms.custom: mvc
@ -138,6 +138,7 @@ To safely perform background work with `HttpContext` data:
* Copy the required data during request processing.
* Pass the copied data to a background task.
* Do ***not*** reference `HttpContext` data in parallel tasks. Extract the data needed from the context before starting the parallel tasks.
To avoid unsafe code, never pass the `HttpContext` into a method that performs background work. Pass the required data instead. In the following example, `SendEmailCore` is called to start sending an email. The `correlationId` is passed to `SendEmailCore`, not the `HttpContext`. Code execution doesn't wait for `SendEmailCore` to complete: