0e83ddf3df
The maven block was first in nginx.conf, and nginx serves the first block for a listen address when no server_name matches. Those two ports used to default to nexus. After the maven block landed, a request with an unknown or absent Host header reached mavweb instead, which is the one surface in the file that can define and run argv. The ACL still held, so this was not an exposure, but it is the wrong default to acquire by accident. The nexus block is now marked default_server so the choice is explicit, and the maven block moved last as a second guard. Also raises client_body_timeout and proxy_send_timeout to match client_max_body_size 32m, since a slow push-to-talk upload was cut at the 60s default on both while proxy_read_timeout was already 300s. Found in review of #52.