This will allow validation to work if the default logging locations cannot be written to but the configuration is otherwise okay. This will be the case for users with custom nginx configurations that log to other places, such as syslog.
- expose an nginx:validate command that can be used to show validation information
- properly reference the invalid nginx config, rather than tell the user that another app's nginx config is invalid when deploying their own app
- allow a user to cleanup bad nginx config files out of band when they are blocking a deploy _without_ requiring knowing where that nginx config is
Note that this may have issues with generated nginx.conf files that depend on other apps or other parts of the nginx config. For now, this is acceptable, though it is something that needs to be field tested.
Closes#3162
1. SPDY has been deprecated and removed from modern browsers:
http://caniuse.com/#feat=spdy
2. HTTP/2 is present in all modern browsers:
http://caniuse.com/#feat=http2
3. SPDY and HTTP/2 are mutually exclusive in port-based `listen` directives:
http://nginx.org/en/docs/http/ngx_http_core_module.html#listen
Caniuse suggests that 74% of global users have a browser that supports
HTTP/2, while only 27% have a browser that supports SPDY. Only IE11 and
Safari support both.
Therefore, when both are available, Dokku should choose HTTP/2 to
maximize the benefit to users.
Certain versions of nginx have bugs that prevent HTTP/2 from properly responding to all clients, thus causing applications to be unavailable.
Closes#2435
Newer versions of nginx drop spdy support in favor of http2, and thus the nginx config that we bundle with dokku causes nginx to fail to reload in certain cases. This change drops spdy support in favor of http2 for versions of nginx greater than 1.9.5.
Closes#2216
Adding a hostname to the $APP/VHOST file will enable it as a virtualhost for the application.
In addition, any hostname set that matches an associated ssl certificate will also be set as an ssl host. Note that if a hostname does not have a matching SSL host, then it will result in an erroring application.
For the moment, running `dokku url` on an app may not correctly display the current hostnames for said app.
