239 lines
6.4 KiB
ReStructuredText
239 lines
6.4 KiB
ReStructuredText
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.. GENERATED by help2rst.py. DO NOT EDIT DIRECTLY.
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.. program:: nghttp
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nghttp(1)
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=========
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SYNOPSIS
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--------
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**nghttp** [OPTIONS]... <URI>...
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DESCRIPTION
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-----------
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HTTP/2 client
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.. describe:: <URI>
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Specify URI to access.
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OPTIONS
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-------
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.. option:: -v, --verbose
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Print debug information such as reception and
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transmission of frames and name/value pairs. Specifying
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this option multiple times increases verbosity.
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.. option:: -n, --null-out
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Discard downloaded data.
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.. option:: -O, --remote-name
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Save download data in the current directory. The
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filename is dereived from URI. If URI ends with '*/*',
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'index.html' is used as a filename. Not implemented
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yet.
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.. option:: -t, --timeout=<DURATION>
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Timeout each request after <DURATION>. Set 0 to disable
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timeout.
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.. option:: -w, --window-bits=<N>
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Sets the stream level initial window size to 2\*\*<N>-1.
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.. option:: -W, --connection-window-bits=<N>
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Sets the connection level initial window size to
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2\*\*<N>-1.
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.. option:: -a, --get-assets
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Download assets such as stylesheets, images and script
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files linked from the downloaded resource. Only links
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whose origins are the same with the linking resource
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will be downloaded. nghttp prioritizes resources using
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HTTP/2 dependency based priority. The priority order,
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from highest to lowest, is html itself, css, javascript
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and images.
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.. option:: -s, --stat
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Print statistics.
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.. option:: -H, --header=<HEADER>
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Add a header to the requests. Example: :option:`-H`\':method: PUT'
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.. option:: --trailer=<HEADER>
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Add a trailer header to the requests. <HEADER> must not
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include pseudo header field (header field name starting
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with ':'). To send trailer, one must use :option:`-d` option to
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send request body. Example: :option:`--trailer` 'foo: bar'.
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.. option:: --cert=<CERT>
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Use the specified client certificate file. The file
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must be in PEM format.
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.. option:: --key=<KEY>
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Use the client private key file. The file must be in
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PEM format.
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.. option:: -d, --data=<PATH>
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Post FILE to server. If '-' is given, data will be read
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from stdin.
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.. option:: -m, --multiply=<N>
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Request each URI <N> times. By default, same URI is not
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requested twice. This option disables it too.
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.. option:: -u, --upgrade
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Perform HTTP Upgrade for HTTP/2. This option is ignored
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if the request URI has https scheme. If :option:`-d` is used, the
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HTTP upgrade request is performed with OPTIONS method.
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.. option:: -p, --weight=<WEIGHT>
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Sets priority group weight. The valid value range is
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[1, 256], inclusive.
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Default: ``16``
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.. option:: -M, --peer-max-concurrent-streams=<N>
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Use <N> as SETTINGS_MAX_CONCURRENT_STREAMS value of
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remote endpoint as if it is received in SETTINGS frame.
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The default is large enough as it is seen as unlimited.
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.. option:: -c, --header-table-size=<SIZE>
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Specify decoder header table size.
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.. option:: -b, --padding=<N>
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Add at most <N> bytes to a frame payload as padding.
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Specify 0 to disable padding.
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.. option:: -r, --har=<PATH>
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Output HTTP transactions <PATH> in HAR format. If '-'
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is given, data is written to stdout.
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.. option:: --color
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Force colored log output.
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.. option:: --continuation
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Send large header to test CONTINUATION.
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.. option:: --no-content-length
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Don't send content-length header field.
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.. option:: --no-dep
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Don't send dependency based priority hint to server.
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.. option:: --hexdump
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Display the incoming traffic in hexadecimal (Canonical
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hex+ASCII display). If SSL/TLS is used, decrypted data
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are used.
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.. option:: --no-push
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Disable server push.
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.. option:: --max-concurrent-streams=<N>
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The number of concurrent pushed streams this client
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accepts.
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.. option:: --version
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Display version information and exit.
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.. option:: -h, --help
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Display this help and exit.
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The <SIZE> argument is an integer and an optional unit (e.g., 10K is
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10 * 1024). Units are K, M and G (powers of 1024).
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The <DURATION> argument is an integer and an optional unit (e.g., 1s
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is 1 second and 500ms is 500 milliseconds). Units are h, m, s or ms
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(hours, minutes, seconds and milliseconds, respectively). If a unit
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is omitted, a second is used as unit.
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DEPENDENCY BASED PRIORITY
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-------------------------
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nghttp sends priority hints to server by default unless
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:option:`--no-dep` is used. nghttp mimics the way Firefox employs to
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manages dependency using idle streams. We follows the behaviour of
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Firefox Nightly as of April, 2015, and nghttp's behaviour is very
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static and could be different from Firefox in detail. But reproducing
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the same behaviour of Firefox is not our goal. The goal is provide
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the easy way to test out the dependency priority in server
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implementation.
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When connection is established, nghttp sends 5 PRIORITY frames to idle
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streams 3, 5, 7, 9 and 11 to create "anchor" nodes in dependency
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tree::
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+-----+
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|id=0 |
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+-----+
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^ ^ ^
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w=201 / | \ w=1
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/ | \
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/ w=101| \
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+-----+ +-----+ +-----+
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|id=3 | |id=5 | |id=7 |
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+-----+ +-----+ +-----+
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^ ^
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w=1 | w=1 |
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+-----+ +-----+
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|id=11| |id=9 |
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+-----+ +-----+
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In the above figure, ``id`` means stream ID, and ``w`` means weight.
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The stream 0 is non-existence stream, and forms the root of the tree.
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The stream 7 and 9 are not used for now.
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The URIs given in the command-line depend on stream 11 with the weight
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given in :option:`-p` option, which defaults to 16.
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If :option:`-a` option is used, nghttp parses the resource pointed by
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URI given in command-line as html, and extracts resource links from
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it. When requesting those resources, nghttp uses dependency according
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to its resource type.
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For CSS, and Javascript files inside "head" element, they depend on
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stream 3 with the weight 2. The Javascript files outside "head"
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element depend on stream 5 with the weight 2. The mages depend on
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stream 11 with the weight 12. The other resources (e.g., icon) depend
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on stream 11 with the weight 2.
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SEE ALSO
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--------
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:manpage:`nghttpd(1)`, :manpage:`nghttpx(1)`, :manpage:`h2load(1)`
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