How to map subject email address to request header name?

[Cantor, Scott]

> I would like to map this email address to an HTTP request header named
> "ShibAuthdUserEmail".
> 
> Can you tell me how to do this?  What should be in attribute-map.xml?  And
> in Shibboleth2.xml?

https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPAttributeExtractor

"The name property corresponds to the Name XML attribute of a SAML <Attribute> element or the Format XML attribute of a SAML <NameID>/<NameIdentifier> element."

Map the format as an attribute name.

-- Scott