on-headers

WebJar for on-headers

License	MIT
GroupId	org.webjars.npm
ArtifactId	on-headers
Last Version	1.0.2
Release Date	Mar 25, 2019
Type	jar
Description	on-headers WebJar for on-headers
Project URL	http://webjars.org
Source Code Management	https://github.com/jshttp/on-headers

Download on-headers

Filename	Size
on-headers-1.0.2.pom
on-headers-1.0.2.jar	5 KB
on-headers-1.0.2-sources.jar	22 bytes
on-headers-1.0.2-javadoc.jar	22 bytes

How to add to project

Apache Maven

<!-- https://jarcasting.com/artifacts/org.webjars.npm/on-headers/ -->
<dependency>
    <groupId>org.webjars.npm</groupId>
    <artifactId>on-headers</artifactId>
    <version>1.0.2</version>
</dependency>

Gradle Groovy

// https://jarcasting.com/artifacts/org.webjars.npm/on-headers/
implementation 'org.webjars.npm:on-headers:1.0.2'

Gradle Kotlin

// https://jarcasting.com/artifacts/org.webjars.npm/on-headers/
implementation ("org.webjars.npm:on-headers:1.0.2")

Apache Buildr

'org.webjars.npm:on-headers:jar:1.0.2'

Apache Ivy

<dependency org="org.webjars.npm" name="on-headers" rev="1.0.2">
  <artifact name="on-headers" type="jar" />
</dependency>

Groovy Grape

@Grapes(
@Grab(group='org.webjars.npm', module='on-headers', version='1.0.2')
)

Scala SBT

libraryDependencies += "org.webjars.npm" % "on-headers" % "1.0.2"

Leiningen

[org.webjars.npm/on-headers "1.0.2"]

Dependencies

There are no dependencies for this project. It is a standalone project that does not depend on any other jars.

Project Modules

There are no modules declared in this project.

on-headers

Execute a listener when a response is about to write headers.

Installation

This is a Node.js module available through the npm registry. Installation is done using the npm install command:

$ npm install on-headers

API

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 listeners are fired in the reverse order they were added.

Examples

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

$ npm test

License

MIT

Low-Level JavaScript HTTP-related Modules

Versions

Version
1.0.2 Mar 25, 2019
1.0.1 Jun 19, 2016