HttpRequestMessageExtensions not being found at run-time in Azure Function

Question

I\'ve got an Azure Function app that creates a precompiled DLL (so it uses normal .cs files, not the older .csx method, pre-VS2017). Previously, it was targeting .Net Framew

Answer 1

Using @Aaron-Newton's insight, I identified that my issue was due to my Azure Functions project referencing a .Net Standard 2.0 class library. I switched it to .Net Framework 4.6 and it started working again. Seems like this is a bug in the Functions tooling.

I've filed a bug with the Functions team here: https://github.com/Azure/Azure-Functions/issues/477