Possibility to amend multi value header e.g. Set-Cookie?

Hi,

Is there any possibility to loop through multi-value request header and change it?

```

... How can I loop through multi value header and update each value of context.Request.Headers["Set-Cookie"]

```

Start with the issue's Set-Cookie policy example and inspect the repository's existing Azure API Management policy snippets for header handling. Determine whether multi-value request or response headers can be iterated and updated; done means a documented reusable example or a confirmed limitation with the supported alternative.

Written by the indexing model from the issue text.