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+# on-headers
+
+[![NPM Version][npm-image]][npm-url]
+[![NPM Downloads][downloads-image]][downloads-url]
+[![Node.js Version][node-version-image]][node-version-url]
+[![Build Status][travis-image]][travis-url]
+[![Test Coverage][coveralls-image]][coveralls-url]
+
+Execute a listener when a response is about to write headers.
+
+## Installation
+
+```sh
+$ npm install on-headers
+```
+
+## API
+
+```js
+var onHeaders = require('on-headers')
+```
+
+### onHeaders(res, listener)
+
+This will add the listener `listener` to fire when headers are emitted for `res`.
+The listener is passed the `response` object as it's context (`this`). Headers are
+considered to be emitted only once, right before they are sent to the client.
+
+When this is called multiple times on the same `res`, the `listener`s are fired
+in the reverse order they were added.
+
+## Examples
+
+```js
+var http = require('http')
+var onHeaders = require('on-headers')
+
+http
+.createServer(onRequest)
+.listen(3000)
+
+function addPoweredBy() {
+  // set if not set by end of request
+  if (!this.getHeader('X-Powered-By')) {
+    this.setHeader('X-Powered-By', 'Node.js')
+  }
+}
+
+function onRequest(req, res) {
+  onHeaders(res, addPoweredBy)
+
+  res.setHeader('Content-Type', 'text/plain')
+  res.end('hello!')
+}
+```
+
+## Testing
+
+```sh
+$ npm test
+```
+
+## License
+
+[MIT](LICENSE)
+
+[npm-image]: https://img.shields.io/npm/v/on-headers.svg
+[npm-url]: https://npmjs.org/package/on-headers
+[node-version-image]: https://img.shields.io/node/v/on-headers.svg
+[node-version-url]: http://nodejs.org/download/
+[travis-image]: https://img.shields.io/travis/jshttp/on-headers/master.svg
+[travis-url]: https://travis-ci.org/jshttp/on-headers
+[coveralls-image]: https://img.shields.io/coveralls/jshttp/on-headers/master.svg
+[coveralls-url]: https://coveralls.io/r/jshttp/on-headers?branch=master
+[downloads-image]: https://img.shields.io/npm/dm/on-headers.svg
+[downloads-url]: https://npmjs.org/package/on-headers