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"928f5d0f470d49342651ea6794b0857c100693f7", "registry": "npmjs" }, "on-headers-1.0.2.tgz": { "url": "https://registry.npmjs.org/on-headers/-/on-headers-1.0.2.tgz", "sha": "772b0ae6aaa525c399e489adfad90c403eb3c28f", "registry": "npmjs" } }, "_attachments": {}, "_rev": "1-1575c9d84bf7c9bb", "_id": "on-headers", "readme": "# on-headers\n\n[![NPM Version][npm-version-image]][npm-url]\n[![NPM Downloads][npm-downloads-image]][npm-url]\n[![Node.js Version][node-version-image]][node-version-url]\n[![Build Status][travis-image]][travis-url]\n[![Test Coverage][coveralls-image]][coveralls-url]\n\nExecute a listener when a response is about to write headers.\n\n## Installation\n\nThis is a [Node.js](https://nodejs.org/en/) module available through the\n[npm registry](https://www.npmjs.com/). Installation is done using the\n[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):\n\n```sh\n$ npm install on-headers\n```\n\n## API\n\n\n\n```js\nvar onHeaders = require('on-headers')\n```\n\n### onHeaders(res, listener)\n\nThis will add the listener `listener` to fire when headers are emitted for `res`.\nThe listener is passed the `response` object as it's context (`this`). Headers are\nconsidered to be emitted only once, right before they are sent to the client.\n\nWhen this is called multiple times on the same `res`, the `listener`s are fired\nin the reverse order they were added.\n\n## Examples\n\n```js\nvar http = require('http')\nvar onHeaders = require('on-headers')\n\nhttp\n .createServer(onRequest)\n .listen(3000)\n\nfunction addPoweredBy () {\n // set if not set by end of request\n if (!this.getHeader('X-Powered-By')) {\n this.setHeader('X-Powered-By', 'Node.js')\n }\n}\n\nfunction onRequest (req, res) {\n onHeaders(res, addPoweredBy)\n\n res.setHeader('Content-Type', 'text/plain')\n res.end('hello!')\n}\n```\n\n## Testing\n\n```sh\n$ npm test\n```\n\n## License\n\n[MIT](LICENSE)\n\n[coveralls-image]: https://badgen.net/coveralls/c/github/jshttp/on-headers/master\n[coveralls-url]: https://coveralls.io/r/jshttp/on-headers?branch=master\n[node-version-image]: https://badgen.net/npm/node/on-headers\n[node-version-url]: https://nodejs.org/en/download\n[npm-downloads-image]: https://badgen.net/npm/dm/on-headers\n[npm-url]: https://npmjs.org/package/on-headers\n[npm-version-image]: https://badgen.net/npm/v/on-headers\n[travis-image]: https://badgen.net/travis/jshttp/on-headers/master\n[travis-url]: https://travis-ci.org/jshttp/on-headers" }