If the -T option is passed, additionally to configuration test, configuration
files are output to stdout.

In the debug mode, configuration files are kept in memory and can be accessed
using a debugger.

The new name is consistent with the ngx_proxy_protocol_write function.

The new directive "proxy_protocol" toggles sending out PROXY protocol header
to upstream once connection is established.

The function is now called ngx_parse_http_time(), and can be used by
any code to parse HTTP-style date and time.  In particular, it will be
used for OCSP stapling.

For compatibility, a macro to map ngx_http_parse_time() to the new name
provided for a while.

stream {
    server {
        ...
        allow 127.0.0.1;
        deny all;
    }
}