h2o --help

gistfile1.txt

h2o version 0.9.0

Usage:
  h2o [options]

Options:
  -c, --conf FILE  configuration file (default: h2o.conf)
  -t, --test       tests the configuration
  -v, --version    prints the version number
  -h, --help       print this help

Configuration File:
  The configuration file should be written in YAML format.  Below is the list
  of configuration directives; the flags indicate at which level the directives
  can be used; g=global, h=host, p=path.

  hosts: [g]
    map of hostname -> map of per-host configs
  paths: [h]
    map of URL-path -> configuration

  limit-request-body: [g]
    maximum size of request body in bytes (e.g. content of POST)
    (default: unlimited)
  http1-request-timeout: [g]
    timeout for incoming requests in seconds (default: 10)
  http1-upgrade-to-http2: [g]
    boolean flag (ON/OFF) indicating whether or not to allow upgrade to HTTP/2
    (default: ON)
  http2-idle-timeout: [g]
    timeout for idle connections in seconds (default: 10)
  http2-max-concurrent-requests-per-connection: [g]
    max. number of requests to be handled concurrently within a single HTTP/2
    stream (default: 16)

  listen: [gh]
    port at which the server should listen for incoming requests (mandatory)
     - if the value is a scalar, it is treated as the port number (or as the
       service name)
     - if the value is a mapping, following properties are recognized:
         port: incoming port number or service name (mandatory)
         host: incoming address (default: any address)
         ssl: mapping of SSL configuration using the keys below (default: none)
           certificate-file: path of the SSL certificate file (mandatory)
           key-file:         path of the SSL private key file (mandatory)
           minimum-version:  minimum protocol version, should be one of: SSLv2,
                             SSLv3, TLSv1, TLSv1.1, TLSv1.2 (default: TLSv1)
     - if the value is a sequence, each element should be either a scalar or a
       mapping that conform to the requirements above

  user: [g]
    user under with the server should handle incoming requests (default: none)
  max-connections: [g]
    max connections (default: 1024)
  num-threads: [g]
    number of worker threads (default: 1)

  access-log: [ghp]
    path and optionally the format of the access log (default: none)
      - if the value is a scalar, it is treated as the path of the log file
      - if the value is a mapping, its `path` property is treated as the path
        and `format` property is treated as the format
      - if the path starts with `|`, the rest of the path is considered as a 
        command pipe to which the logs should be emitted
    following format strings are recognized:
      %h:         remote host
      %l:         remote logname (always '-')
      %u:         remote user (always '-')
      %t:         request time
      %r:         first line of request
      %s:         status
      %b:         size of the response body in bytes
      %{Foobar}i: the contents of the request header `Foobar`
      %{Foobar}o: the contents of the response header `Foobar`

  file.dir: [p]
    directory under which to serve the target path
  file.index: [ghp]
    sequence of index file names (default: index.html index.htm index.txt)
  file.mime.settypes: [ghp]
    map of mime-type -> (extension | sequence-of-extensions)
  file.mime.addtypes: [ghp]
    map of mime-type -> (extension | sequence-of-extensions)
  file.mime.removetypes: [ghp]
    sequence of extensions
  file.mime.setdefaulttype: [ghp]
    default mime-type
  file.etag: [ghp]
    whether or not to send etag (ON or OFF, default: ON)
  file.dirlisting: [ghp]
    whether or not to send directory indexes (ON or OFF, default: OFF)

  proxy.reverse.url: [p]
    upstream URL (only HTTP is suppported)
  proxy.keepalive: [ghp]
    boolean flag (ON/OFF) indicating whether or not to use persistent
    connections to upstream (default: OFF)
  proxy.timeout.io: [ghp]
    sets upstream I/O timeout (in milliseconds, default: 5000)
  proxy.timeout.keepalive: [ghp]
    timeout for idle conncections (in milliseconds, default: 2000)