[Web-SIG] proxy-connection header in wsgiref.utils.is_hop_by_hop

[Mikeal Rogers]

I implemented a functional proxy last night using wsgiref and I  
noticed that 'proxy-connection' isn't in the _hoppish dict.

Although proxy-connection isn't in the HTTP 1.1 spec as hop-by-hop it  
is an anomalous HTTP 1.0 header that is treated as a hop-by-hop  
header in most cases and is removed by the proxy when fulfilling  
requests.

Should it be added to the _hoppish dict?

-Mikeal