area/extensionarea/routerenhancementhelp wanted
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描述
Title: support formatted cluster header
Description:
cluster_header is used to select dynamic upstream cluster based on the request headers.
This function is very useful. But I would like to make this feature more flexible with a core.v3.TypedExtensionConfig API. Like being able to select an upstream cluster based on a number of different headers, or formatting the header values and selecting the corresponding upstream cluster, etc.