This command line argunment allows someone to pass an environement variable to
gunicorn:
$ gunicorn --env FOO=1 test:app
With the command line above the application will be able to use the FOO
environment vatriable.
Instead of faking STDIN/STDERR to a fake object that we close on reopen,
simply redirect them to a file and reopen this one when need.
Should fix most of the issues on #309
This patch makes sure that we now handle correctly bytes and native
strings on python 3:
- In python 3, sockets are now taking and returning bytes.
- according to PEP3333, headers should be native strings and body in
bytes.
Intoduce a change in log access format:
- request headers are now added to the log format using the
{HeaderName}i variable
- response headers are now handled using the {HeaderName}o variables
- headers name are insensitive
- non existent keys in the log access format are replaced by '-'
