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"readme": "# on-headers\n\n[![NPM Version][npm-image]][npm-url]\n[![NPM Downloads][downloads-image]][downloads-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\n```sh\n$ npm install on-headers\n```\n\n## API\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[npm-image]: https://img.shields.io/npm/v/on-headers.svg\n[npm-url]: https://npmjs.org/package/on-headers\n[node-version-image]: https://img.shields.io/node/v/on-headers.svg\n[node-version-url]: http://nodejs.org/download/\n[travis-image]: https://img.shields.io/travis/jshttp/on-headers/master.svg\n[travis-url]: https://travis-ci.org/jshttp/on-headers\n[coveralls-image]: https://img.shields.io/coveralls/jshttp/on-headers/master.svg\n[coveralls-url]: https://coveralls.io/r/jshttp/on-headers?branch=master\n[downloads-image]: https://img.shields.io/npm/dm/on-headers.svg\n[downloads-url]: https://npmjs.org/package/on-headers\n",
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