[PATCH] Allow returning 407 status

[Raimon Grau]

Hi,

Nginx forbids returning 407 (Proxy Authorization Required). If we
allow it, we can play with headers and make it a regular http proxy.

With some nginx external modules like ngx-lua, we could even debug
mobile apps, or http traffic

Regards,
Rai

PS: It's my first email/patch here. I'm sorry if there's any
convention I'm not following. I tried my best :)

-- 
Raimon Grau
3scale Networks
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