This file is indexed.

/etc/nghttpx/nghttpx.conf is in nghttp2-proxy 1.30.0-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# Sample configuration file for nghttpx.
#
# * Line staring '#' is treated as comment.
#
# * The option name in the configuration file is the long command-line
#   option name with leading '--' stripped (e.g., frontend). Put '='
#   between option name and value. Don't put extra leading or trailing
#   spaces.
#
# * The options which do not take argument in the command-line *take*
#   argument in the configuration file. Specify 'yes' as argument
#   (e.g., http2-proxy=yes). If other string is given, it disables the
#   option.
#
# * To specify private key and certificate file, use private-key-file
#   and certificate-file. See the examples below.
#
# * conf option cannot be used in the configuration file. It will be
#   ignored.
#
# Examples:

# Example 1
# Proxying an HTTP server on localhost:80 to localhost:3000 (no TLS)
frontend=127.0.0.1,3000;no-tls
backend=127.0.0.1,80
errorlog-syslog=yes
workers=1

# Example 2
# Proxying localhost:80 on all interfaces, port 3000 (TLS enabled)
# frontend=0.0.0.0,3000
# backend=127.0.0.1,80
# private-key-file=/path/to/server.key
# certificate-file=/path/to/server.crt
# http2-proxy=no
# workers=1

# For comprehensive list of configuration options see "man nghttpx"