1 | # etag
|
2 |
|
3 | [![NPM Version][npm-image]][npm-url]
|
4 | [![NPM Downloads][downloads-image]][downloads-url]
|
5 | [![Node.js Version][node-version-image]][node-version-url]
|
6 | [![Build Status][travis-image]][travis-url]
|
7 | [![Test Coverage][coveralls-image]][coveralls-url]
|
8 |
|
9 | Create simple HTTP ETags
|
10 |
|
11 | This module generates HTTP ETags (as defined in RFC 7232) for use in
|
12 | HTTP responses.
|
13 |
|
14 | ## Installation
|
15 |
|
16 | This is a [Node.js](https://nodejs.org/en/) module available through the
|
17 | [npm registry](https://www.npmjs.com/). Installation is done using the
|
18 | [`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
|
19 |
|
20 | ```sh
|
21 | $ npm install etag
|
22 | ```
|
23 |
|
24 | ## API
|
25 |
|
26 |
|
27 |
|
28 | ```js
|
29 | var etag = require('etag')
|
30 | ```
|
31 |
|
32 | ### etag(entity, [options])
|
33 |
|
34 | Generate a strong ETag for the given entity. This should be the complete
|
35 | body of the entity. Strings, `Buffer`s, and `fs.Stats` are accepted. By
|
36 | default, a strong ETag is generated except for `fs.Stats`, which will
|
37 | generate a weak ETag (this can be overwritten by `options.weak`).
|
38 |
|
39 |
|
40 |
|
41 | ```js
|
42 | res.setHeader('ETag', etag(body))
|
43 | ```
|
44 |
|
45 | #### Options
|
46 |
|
47 | `etag` accepts these properties in the options object.
|
48 |
|
49 | ##### weak
|
50 |
|
51 | Specifies if the generated ETag will include the weak validator mark (that
|
52 | is, the leading `W/`). The actual entity tag is the same. The default value
|
53 | is `false`, unless the `entity` is `fs.Stats`, in which case it is `true`.
|
54 |
|
55 | ## Testing
|
56 |
|
57 | ```sh
|
58 | $ npm test
|
59 | ```
|
60 |
|
61 | ## Benchmark
|
62 |
|
63 | ```bash
|
64 | $ npm run-script bench
|
65 |
|
66 | > etag@1.8.1 bench nodejs-etag
|
67 | > node benchmark/index.js
|
68 |
|
69 | http_parser@2.7.0
|
70 | node@6.11.1
|
71 | v8@5.1.281.103
|
72 | uv@1.11.0
|
73 | zlib@1.2.11
|
74 | ares@1.10.1-DEV
|
75 | icu@58.2
|
76 | modules@48
|
77 | openssl@1.0.2k
|
78 |
|
79 | > node benchmark/body0-100b.js
|
80 |
|
81 | 100B body
|
82 |
|
83 | 4 tests completed.
|
84 |
|
85 | buffer - strong x 258,647 ops/sec ±1.07% (180 runs sampled)
|
86 | buffer - weak x 263,812 ops/sec ±0.61% (184 runs sampled)
|
87 | string - strong x 259,955 ops/sec ±1.19% (185 runs sampled)
|
88 | string - weak x 264,356 ops/sec ±1.09% (184 runs sampled)
|
89 |
|
90 | > node benchmark/body1-1kb.js
|
91 |
|
92 | 1KB body
|
93 |
|
94 | 4 tests completed.
|
95 |
|
96 | buffer - strong x 189,018 ops/sec ±1.12% (182 runs sampled)
|
97 | buffer - weak x 190,586 ops/sec ±0.81% (186 runs sampled)
|
98 | string - strong x 144,272 ops/sec ±0.96% (188 runs sampled)
|
99 | string - weak x 145,380 ops/sec ±1.43% (187 runs sampled)
|
100 |
|
101 | > node benchmark/body2-5kb.js
|
102 |
|
103 | 5KB body
|
104 |
|
105 | 4 tests completed.
|
106 |
|
107 | buffer - strong x 92,435 ops/sec ±0.42% (188 runs sampled)
|
108 | buffer - weak x 92,373 ops/sec ±0.58% (189 runs sampled)
|
109 | string - strong x 48,850 ops/sec ±0.56% (186 runs sampled)
|
110 | string - weak x 49,380 ops/sec ±0.56% (190 runs sampled)
|
111 |
|
112 | > node benchmark/body3-10kb.js
|
113 |
|
114 | 10KB body
|
115 |
|
116 | 4 tests completed.
|
117 |
|
118 | buffer - strong x 55,989 ops/sec ±0.93% (188 runs sampled)
|
119 | buffer - weak x 56,148 ops/sec ±0.55% (190 runs sampled)
|
120 | string - strong x 27,345 ops/sec ±0.43% (188 runs sampled)
|
121 | string - weak x 27,496 ops/sec ±0.45% (190 runs sampled)
|
122 |
|
123 | > node benchmark/body4-100kb.js
|
124 |
|
125 | 100KB body
|
126 |
|
127 | 4 tests completed.
|
128 |
|
129 | buffer - strong x 7,083 ops/sec ±0.22% (190 runs sampled)
|
130 | buffer - weak x 7,115 ops/sec ±0.26% (191 runs sampled)
|
131 | string - strong x 3,068 ops/sec ±0.34% (190 runs sampled)
|
132 | string - weak x 3,096 ops/sec ±0.35% (190 runs sampled)
|
133 |
|
134 | > node benchmark/stats.js
|
135 |
|
136 | stat
|
137 |
|
138 | 4 tests completed.
|
139 |
|
140 | real - strong x 871,642 ops/sec ±0.34% (189 runs sampled)
|
141 | real - weak x 867,613 ops/sec ±0.39% (190 runs sampled)
|
142 | fake - strong x 401,051 ops/sec ±0.40% (189 runs sampled)
|
143 | fake - weak x 400,100 ops/sec ±0.47% (188 runs sampled)
|
144 | ```
|
145 |
|
146 | ## License
|
147 |
|
148 | [MIT](LICENSE)
|
149 |
|
150 | [npm-image]: https://img.shields.io/npm/v/etag.svg
|
151 | [npm-url]: https://npmjs.org/package/etag
|
152 | [node-version-image]: https://img.shields.io/node/v/etag.svg
|
153 | [node-version-url]: https://nodejs.org/en/download/
|
154 | [travis-image]: https://img.shields.io/travis/jshttp/etag/master.svg
|
155 | [travis-url]: https://travis-ci.org/jshttp/etag
|
156 | [coveralls-image]: https://img.shields.io/coveralls/jshttp/etag/master.svg
|
157 | [coveralls-url]: https://coveralls.io/r/jshttp/etag?branch=master
|
158 | [downloads-image]: https://img.shields.io/npm/dm/etag.svg
|
159 | [downloads-url]: https://npmjs.org/package/etag
|