Update README.rst
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Tatsuhiro Tsujikawa
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README.rst
307
README.rst
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@ -4,9 +4,6 @@ nghttp2 - HTTP/2.0 C Library
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This is an experimental implementation of Hypertext Transfer Protocol
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version 2.0.
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There are command-line header compression test tools in hdtest
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directory. Check out deflatehd and inflatehd commands.
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Development Status
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------------------
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@ -417,3 +414,307 @@ the outside HTTP/2.0 proxy through HTTP proxy::
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--===================---> HTTP/2.0 Proxy
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(HTTP proxy tunnel) (e.g., nghttpx -s)
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Header compression test tools
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-----------------------------
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The ``hdtest`` directory contains header compression test tools. The
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``deflatehd`` is command-line header compression tool. The
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``inflatehd`` is command-line header decompression tool. Both tools
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read input from stdin and write output to stdout. The errors are
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written to stderr. They take JSON as input and output.
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deflatehd - header compressor
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+++++++++++++++++++++++++++++
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The ``deflatehd`` reads JSON array or HTTP/1-style header fields from
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stdin and outputs compressed header block in JSON array.
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For the JSON input, the element of input array must be a JSON
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object. Each object must have at least following key:
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headers
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A JSON array of name/value pairs. The each element is a JSON array
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of 2 strings. The index 0 must contain header name and the index 1
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must contain header value.
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Example::
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[
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{
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"headers": [
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[ ":method", "GET" ],
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[ ":path", "/" ]
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]
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},
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{
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"headers": [
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[ ":method", "POST" ],
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[ ":path", "/" ]
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]
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}
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]
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These header sets are processed in the order they appear in the JSON
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outer most array using same compression context.
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With ``-t`` option, the program can accept more familiar HTTP/1 style
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header field block. Each header set is delimited by empty line:
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Example::
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:method: GET
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:scheme: https
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:path: /
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:method: POST
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user-agent: nghttp2
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The output is a JSON array and each element is JSON object, which has
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at least following keys:
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seq
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The index of header set in the input.
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inputLen
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The sum of length of name/value pair in the input.
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outputLength
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The length of compressed header block.
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percentageOfOriginalSize
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inputLen / outputLength * 100
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output
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The compressed header block in hex string.
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Examples::
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[
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{
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"seq": 0,
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"inputLen": 66,
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"outputLength": 20,
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"percentageOfOriginalSize": 30.303030303030305,
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"output": "818703881f3468e5891afcbf863c856659c62e3f"
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},
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{
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"seq": 1,
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"inputLen": 74,
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"outputLength": 10,
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"percentageOfOriginalSize": 13.513513513513514,
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"output": "87038504252dd5918386"
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}
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]
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The output can be used as the input for ``inflatehd``.
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With ``-d`` option, the extra ``headerTable`` key is added and its
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associated value contains the state of dyanmic header table after the
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corresponding header set was processed. The value contains following
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keys:
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entries
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The entry in the header table. If ``referenced`` is ``true``, it
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is in the reference set. The ``size`` includes the overhead (32
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bytes). The ``index`` corresponds to the index of header table.
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The ``name`` is the header field name and the ``value`` is the
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header field value. They may be displayed as ``**DEALLOCATED**``,
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which means that the memory for that string is freed and not
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available. This will happen when specifying smaller value in
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``-S`` than ``-s``.
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size
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The sum of the spaces entries occupied, this includes the
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entry overhead.
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maxSize
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The maximum header table size.
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localSize
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The sum of the spaces entries occupied within ``maxLocalSize``.
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maxLocalSize
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The maximum header table size encoder uses. This can be smaller
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than ``maxSize``. In this case, encoder only uses up to first
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``maxSize`` buffer.
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Example::
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[
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{
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"seq": 0,
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"inputLen": 66,
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"outputLength": 20,
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"percentageOfOriginalSize": 30.303030303030305,
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"output": "818703881f3468e5891afcbf863c856659c62e3f",
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"headerTable": {
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"entries": [
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{
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"index": 0,
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"name": "user-agent",
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"value": "nghttp2",
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"referenced": true,
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"size": 49
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},
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{
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"index": 1,
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"name": ":path",
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"value": "/",
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"referenced": true,
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"size": 38
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},
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{
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"index": 2,
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"name": ":authority",
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"value": "example.org",
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"referenced": true,
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"size": 53
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},
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{
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"index": 3,
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"name": ":scheme",
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"value": "https",
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"referenced": true,
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"size": 44
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},
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{
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"index": 4,
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"name": ":method",
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"value": "GET",
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"referenced": true,
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"size": 42
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}
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],
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"size": 226,
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"maxSize": 4096,
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"localSize": 226,
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"maxLocalSize": 4096
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}
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},
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{
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"seq": 1,
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"inputLen": 74,
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"outputLength": 10,
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"percentageOfOriginalSize": 13.513513513513514,
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"output": "87038504252dd5918386",
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"headerTable": {
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"entries": [
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{
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"index": 0,
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"name": ":path",
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"value": "/account",
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"referenced": true,
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"size": 45
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},
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{
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"index": 1,
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"name": ":method",
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"value": "POST",
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"referenced": true,
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"size": 43
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},
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{
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"index": 2,
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"name": "user-agent",
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"value": "nghttp2",
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"referenced": true,
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"size": 49
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},
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{
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"index": 3,
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"name": ":path",
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"value": "/",
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"referenced": false,
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"size": 38
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},
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{
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"index": 4,
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"name": ":authority",
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"value": "example.org",
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"referenced": true,
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"size": 53
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},
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{
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"index": 5,
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"name": ":scheme",
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"value": "https",
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"referenced": true,
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"size": 44
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},
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{
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"index": 6,
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"name": ":method",
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"value": "GET",
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"referenced": false,
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"size": 42
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}
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],
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"size": 314,
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"maxSize": 4096,
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"localSize": 314,
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"maxLocalSize": 4096
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}
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}
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]
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inflatehd - header decompressor
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+++++++++++++++++++++++++++++++
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The ``inflatehd`` reads JSON array from stdin and outputs decompressed
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name/value pairs in JSON array. The element of input array must be a
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JSON object. Each object must have at least following key:
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output
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compressed header block in hex string.
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Example::
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[
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{ "output": "0284f77778ff" },
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{ "output": "0185fafd3c3c7f81" }
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]
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The output is a JSON array and each element is JSON object, which has
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at least following keys:
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seq
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The index of header set in the input.
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headers
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The JSON array contains decompressed name/value pairs. Each
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element is JSON aray having 2 elements. The index 0 of the array
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contains the header field name. The index 1 contains the header
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field value.
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Example::
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[
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{
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"seq": 0,
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"headers": [
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[":authority", "example.org"],
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[":method", "GET"],
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[":path", "/"],
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[":scheme", "https"],
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["user-agent", "nghttp2"]
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]
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},
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{
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"seq": 1,
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"headers": [
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[":authority", "example.org"],
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[":method", "POST"],
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[":path", "/account"],
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[":scheme", "https"],
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["user-agent", "nghttp2"]
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]
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}
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]
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The output can be used as the input for ``deflatehd``.
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With ``-d`` option, the extra ``headerTable`` key is added and its
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associated value contains the state of dyanmic header table after the
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corresponding header set was processed. The format is the same as
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``deflatehd``.
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