etag-webcrypto

![NPM Version][npm-version-image] ![NPM Downloads][npm-downloads-image]

A limited edge-ready fork of etag

This module generates HTTP ETags (as defined in RFC 7232) for use in HTTP responses.

Installation

npm install etag-webcrypto
# or
yarn add etag-webcrypto

API

var etag = require('etag')

etag(entity, [options])

Generate a strong ETag for the given entity. This should be the complete body of the entity. Strings and Buffers are accepted. By default, a strong ETag is generated (this can be overwritten by options.weak).

res.setHeader('ETag', etag(body))

Options

etag accepts these properties in the options object.

weak

Specifies if the generated ETag will include the weak validator mark (that is, the leading W/). The actual entity tag is the same. The default value is false.

Testing

$ npm test

Benchmark

$ npm run-script bench

> [email protected] bench nodejs-etag
> node benchmark/index.js

  [email protected]
  [email protected]
  [email protected]
  [email protected]
  [email protected]
  [email protected]
  [email protected]
  modules@48
  [email protected]

> node benchmark/body0-100b.js

  100B body

  4 tests completed.

  buffer - strong x 258,647 ops/sec ±1.07% (180 runs sampled)
  buffer - weak   x 263,812 ops/sec ±0.61% (184 runs sampled)
  string - strong x 259,955 ops/sec ±1.19% (185 runs sampled)
  string - weak   x 264,356 ops/sec ±1.09% (184 runs sampled)

> node benchmark/body1-1kb.js

  1KB body

  4 tests completed.

  buffer - strong x 189,018 ops/sec ±1.12% (182 runs sampled)
  buffer - weak   x 190,586 ops/sec ±0.81% (186 runs sampled)
  string - strong x 144,272 ops/sec ±0.96% (188 runs sampled)
  string - weak   x 145,380 ops/sec ±1.43% (187 runs sampled)

> node benchmark/body2-5kb.js

  5KB body

  4 tests completed.

  buffer - strong x 92,435 ops/sec ±0.42% (188 runs sampled)
  buffer - weak   x 92,373 ops/sec ±0.58% (189 runs sampled)
  string - strong x 48,850 ops/sec ±0.56% (186 runs sampled)
  string - weak   x 49,380 ops/sec ±0.56% (190 runs sampled)

> node benchmark/body3-10kb.js

  10KB body

  4 tests completed.

  buffer - strong x 55,989 ops/sec ±0.93% (188 runs sampled)
  buffer - weak   x 56,148 ops/sec ±0.55% (190 runs sampled)
  string - strong x 27,345 ops/sec ±0.43% (188 runs sampled)
  string - weak   x 27,496 ops/sec ±0.45% (190 runs sampled)

> node benchmark/body4-100kb.js

  100KB body

  4 tests completed.

  buffer - strong x 7,083 ops/sec ±0.22% (190 runs sampled)
  buffer - weak   x 7,115 ops/sec ±0.26% (191 runs sampled)
  string - strong x 3,068 ops/sec ±0.34% (190 runs sampled)
  string - weak   x 3,096 ops/sec ±0.35% (190 runs sampled)

License

MIT