Sets the default file to serve if a directory is requested by the client.
syntax: index filename [filename... [fallback]]
default: index index.html
context: http, server, location
Sets the default file to serve if a directory is requested by the client. Multiple files can be specified. If the first file isn't found, the second will be used and so on. If the last entry begins with a /, and none of the earlier files are found, nginx will perform an internal redirect to this uri.