request.headers.get() returns string with commas instead of semicolons as delimiter on Windows

[ibenrh]

When using request.headers.get("cookie") on https I get a string that uses commas instead of semicolons as delimiters, even though the cookie in the Header in browser clearly has semicolons as delimiters.

Example: https://github.com/pellebjerkestrand/azure-functions-core-tools-https-cookie-commas

The expected behavior is for the delimiter to be the same as in the browser.

[ejizba]

I can repro this on windows with --useHttps. Interestingly, the problem seems to go away if you use the preview http streaming feature.

app.setup({ enableHttpStream: true });

I'm pretty sure our node.js logic is just passing along the headers we get from the host, so this one might have to be addressed in the host

Possibly related to Azure/azure-functions-host#4486 and/or dotnet/runtime#42856. Note it's confusing because "Set-Cookie" is supposed to use a comma as a delimiter but "Cookie" is supposed to use a semicolon.