Revert "Disable input buffering when 'Connection: Upgrade' header is set."
Revert "Disable input buffering when 'Connection: Upgrade' header is set."

This reverts commit df8d020afd8c51998b96f3aac79764f09d321f69.

After some thinking this is not a good idea. An attacker can abuse this
feature to disable input buffering, resulting in a DoS. It's probably
best to require explicit disabling of input buffering in the config.

bf4/passenger,phusion/passenger,clemensg/passenger,phusion/passenger,phusion/passenger,kewaunited/passenger,cgvarela/passenger,cgvarela/passenger,antek-drzewiecki/passenger,antek-drzewiecki/passenger,phusion/passenger,jawj/passenger,jawj/passenger,jawj/passenger,antek-drzewiecki/passenger,kewaunited/passenger,cgvarela/passenger,kewaunited/passenger,bf4/passenger,cgvarela/passenger,clemensg/passenger,antek-drzewiecki/passenger,bf4/passenger,jawj/passenger,antek-drzewiecki/passenger,phusion/passenger,antek-drzewiecki/passenger,clemensg/passenger,kewaunited/passenger,cgvarela/passenger,bf4/passenger,jawj/passenger,phusion/passenger,clemensg/passenger,phusion/passenger,cgvarela/passenger,cgvarela/passenger,clemensg/passenger,antek-drzewiecki/passenger,kewaunited/passenger,bf4/passenger,clemensg/passenger,bf4/passenger,phusion/passenger,bf4/passenger,antek-drzewiecki/passenger,jawj/passenger,jawj/passenger,clemensg/passenger,kewaunited/passenger,kewaunited/passenger,cgvarela/passenger,kewaunited/passenger,clemensg/passenger