learnyounode

<!DOCTYPE html><html lang="en"><head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>HTTP | Node.js v12.10.0 Documentation</title> <link rel="stylesheet" href="data:text/css;base64,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"> <link rel="stylesheet" href="data:text/css;base64,/*--------------------- Layout and Typography ----------------------------*/
html {
  font-size: 1rem;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-variant-ligatures: none;
          font-variant-ligatures: none;
}

* {
  box-sizing: border-box;
}

body {
  font-family: "Lato", "Lucida Grande", "Lucida Sans Unicode", "Lucida Sans", Verdana, Tahoma, sans-serif;
  margin: 0;
  padding: 0;
  color: #333;
  background: #fff;
}

h1 { font-size: 2.5rem }
h2 { font-size: 2rem }
h3 { font-size: 1.75rem }
h4 { font-size: 1.5rem }
h5 { font-size: 1.25rem }
h6 { font-size: 1rem }

h1, h2, h3, h4, h5, h6 {
  margin: 1.5rem 0 1rem;
  text-rendering: optimizeLegibility;
  font-weight: 700;
  position: relative;
}

pre, tt, code, .pre, span.type, a.type {
  font-family: SFMono-Regular, Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: .9em;
}

#content {
  position: relative;
}

a, a:link, a:active {
  color: #43853d;
  text-decoration: none;
  border-radius: 2px;
  padding: 1px 3px;
}

a:hover, a:focus {
  color: #fff;
  background-color: #43853d;
  outline: none;
}

strong {
  font-weight: 700;
}

code a:hover {
  background: none;
}

em code {
  font-style: normal;
}

#changelog #gtoc {
  display: none;
}

#gtoc {
  margin-top: .5rem;
  margin-bottom: 1rem;
}

#gtoc ul {
  list-style: none;
  margin-left: 0;
  line-height: 1.5rem;
}

#gtoc > ul > li {
  display: inline;
  border-right: 1px #000 solid;
  margin-right: 0.4rem;
  padding-right: 0.4rem;
}

#gtoc > ul > li:last-child {
  border-right: none;
  margin-right: 0;
  padding-right: 0;
}

li.version-picker {
  position: relative;
}

li.version-picker:hover > a {
  border-radius: 2px 2px 0 0;
}

li.version-picker:hover > ol {
  display: block;
  z-index: 1;
}

li.version-picker a span {
  font-size: .7rem;
}

ol.version-picker {
  background: #fff;
  border: 1px #43853d solid;
  border-radius: 0 0 2px 2px;
  display: none;
  list-style: none;
  position: absolute;
  right: 0;
  top: 1.25rem;
  width: 100%;
}

#gtoc ol.version-picker li {
  display: block;
  border-right: 0;
  margin-right: 0;
}

ol.version-picker li a {
  border-radius: 0;
  display: block;
  margin: 0;
  padding: .1rem;
  padding-left: 1rem;
}

ol.version-picker li:last-child a {
  border-bottom-right-radius: 1px;
  border-bottom-left-radius: 1px;
}

.line {
  width: calc(100% - 1rem);
  display: block;
  padding-bottom: 1px;
}

.api_stability {
  color: white !important;
  margin: 0 0 1rem 0;
  font-family: "Lato", "Lucida Grande", "Lucida Sans Unicode", "Lucida Sans", Verdana, Tahoma, sans-serif;
  padding: 1rem;
  line-height: 1.5;
}

.api_stability * {
  color: white !important;
}

.api_stability a {
  text-decoration: underline;
}

.api_stability a:hover, .api_stability a:active, .api_stability a:focus {
  background: rgba(255, 255, 255, .4);
}

.api_stability a code {
  background: none;
}

.api_stability_0 {
  background-color: #D60027;
}

.api_stability_1 {
  background-color: #EC5315;
}

.api_stability_2 {
  background-color: #4EBA0F;
}

.api_metadata {
  font-size: .85rem;
  margin-bottom: 1rem;
}

.api_metadata span {
  margin-right: 1rem;
}

.api_metadata span:last-child {
  margin-right: 0px;
}

ul.plain {
  list-style: none;
}

abbr {
  border-bottom: 1px dotted #454545;
}

p {
  text-rendering: optimizeLegibility;
  margin: 0 0 1.125rem 0;
  line-height: 1.5;
}

#apicontent > *:last-child {
  margin-bottom: 0;
  padding-bottom: 2rem;
}

table {
  border-collapse: collapse;
  margin: 0 0 1.5rem 0;
}

th, td {
  border: 1px solid #aaa;
  padding: .75rem 1rem .75rem 1rem;
  vertical-align: top;
}

th {
  text-align:left;
}

ol, ul, dl {
  margin: 0 0 .6rem 0;
  padding: 0;
}

ol ul, ol ol, ol dl, ul ul, ul ol, ul dl, dl ul, dl ol, dl dl {
  margin-bottom: 0;
}

ul, ol {
  margin-left: 2rem;
}

dl dt {
  position: relative;
  margin: 1.5rem 0 0;
}

dl dd {
  position: relative;
  margin: 0 1rem 0;
}

dd + dt.pre {
  margin-top: 1.6rem;
}

#apicontent {
  padding-top: 1rem;
}

#apicontent .line {
  width: calc(50% - 1rem);
  margin: 1rem 1rem .95rem;
  background-color: #ccc;
}

h2 + h2 {
  margin: 0 0 .5rem;
}

h3 + h3 {
  margin: 0 0 .5rem;
}

h2, h3, h4, h5 {
  position: relative;
  padding-right: 40px;
}

.srclink {
  float: right;
  font-size: smaller;
}

h1 span, h2 span, h3 span, h4 span {
  position: absolute;
  display: block;
  top: 0;
  right: 0;
}

h1 span:hover, h2 span:hover, h3 span:hover, h4 span:hover {
  opacity: 1;
}

h1 span a, h2 span a, h3 span a, h4 span a {
  color: #000;
  text-decoration: none;
  font-weight: bold;
}

pre, tt, code {
  line-height: 1.5rem;
  margin: 0; padding: 0;
}

.pre {
  line-height: 1.5rem;
}

pre {
  padding: 1rem;
  vertical-align: top;
  background: #f2f2f2;
  margin: 1rem;
  overflow-x: auto;
}

pre > code {
  padding: 0;
}

pre + h3 {
  margin-top: 2.225rem;
}

code.pre {
  white-space: pre;
}

#intro {
  margin-top: 1.25rem;
  margin-left: 1rem;
}

#intro a {
  color: #ddd;
  font-weight: bold;
}

hr {
  background: none;
  border: medium none;
  border-bottom: 1px solid #7a7a7a;
  margin: 0 0 1rem 0;
}

#toc h2 {
  margin-top: 0;
  margin: 1.5rem 0;
}

#toc p {
  margin: 0;
}

#toc ul a {
  text-decoration:none;
}

#toc ul li {
  margin-bottom: .666rem;
  list-style: square outside;
}

#toc li > ul {
  margin-top: .666rem;
}

#toc .stability_0::after {
  background-color: #d50027;
  color: #fff;
  content: "deprecated";
  margin-left: .25rem;
  padding: 1px 3px;
  border-radius: 3px;
}

#apicontent li {
  margin-bottom: .5rem;
}

#apicontent li:last-child {
  margin-bottom: 0;
}

tt, code {
  color: #040404;
  background-color: #f2f2f2;
  border-radius: 2px;
  padding: 1px 3px;
}

.api_stability code {
  background: rgba(0, 0, 0, .1);
}

a code {
  color: inherit;
  background: inherit;
  padding: 0;
}

.type {
  line-height: 1.5rem;
}

#column1.interior {
  margin-left: 234px;
  padding: 0 2rem;
  -webkit-padding-start: 1.5rem;
}

#column2.interior {
  width: 234px;
  background: #333;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  overflow-x: hidden;
  overflow-y: scroll;
}

#column2 ul {
  list-style: none;
  margin: .9rem 0 .5rem;
  background: #333;
}

#column2 > :first-child {
  margin: 1.25rem;
  font-size: 1.5rem;
}

#column2 > ul:nth-child(2) {
  margin: 1.25rem 0 .5rem;
}

#column2 > ul:last-child {
  margin: .9rem 0 1.25rem;
}

#column2 ul li {
  padding-left: 1.25rem;
  margin-bottom: .5rem;
  padding-bottom: .5rem;
}

#column2 .line {
  margin: 0 .5rem;
  background-color: #707070;
}

#column2 ul li:last-child {
  margin-bottom: 0;
}

#column2 ul li a {
  color: #ccc;
  border-radius: 0;
}

#column2 ul li a.active, #column2 ul li a.active:hover,
#column2 ul li a.active:focus {
  color: #43853d;
  border-radius: 0;
  border-bottom: 1px solid #43853d;
  background: none;
}

#intro a:hover, #intro a:focus,
#column2 ul li a:hover, #column2 ul li a:focus {
  color: #fff;
  background: none;
}

span > .mark, span > .mark:visited {
  color: #707070;
  position: absolute;
  top: 0px;
  right: 0px;
}

span > .mark:hover, span > .mark:focus, span > .mark:active {
  color: #43853d;
  background: none;
}

th > *:last-child, td > *:last-child {
  margin-bottom: 0;
}

.changelog > summary {
  margin: .5rem 0;
  padding: .5rem 0;
  cursor: pointer;
}

/* simpler clearfix */
.clearfix:after {
  content: ".";
  display: block;
  height: 0;
  clear: both;
  visibility: hidden;
}

.github_icon {
  vertical-align: middle;
  margin: -2px 3px 0 0;
}

@media only screen and (max-width: 1024px) {
  #content {
    overflow: visible;
  }
  #column1.interior {
    margin-left: 0;
    padding-left: .5rem;
    padding-right: .5rem;
    width: auto;
    overflow-y: visible;
  }
  #column2 {
    display: none;
  }
}

@media print {
  html {
    height: auto;
    font-size: 0.75em;
  }
  #column2.interior {
    display: none;
  }
  #column1.interior {
    margin-left: 0px;
    padding: 0px;
    overflow-y: auto;
  }
  .api_metadata,
  #toc,
  .srclink,
  #gtoc,
  .mark {
    display: none;
  }
  h1 {
    font-size: 2rem;
  }
  h2 {
    font-size: 1.75rem;
  }
  h3 {
    font-size: 1.5rem;
  }
  h4 {
    font-size: 1.3rem;
  }
  h5 {
    font-size: 1.2rem;
  }
  h6 {
    font-size: 1.1rem;
  }
  .api_stability {
    display: inline-block;
  }
  .api_stability a {
    text-decoration: none;
  }
  a {
    color: inherit;
  }
  #apicontent {
    overflow: hidden;
  }
}
"> <link rel="stylesheet" href="data:text/css;base64,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"> <link rel="canonical" href="https://nodejs.org/api/http.html"> </head> <body class="alt apidoc" id="api-section-http"> <div id="content" class="clearfix"> <div id="column2" class="interior"> <div id="intro" class="interior"> <a href="https://nodejs.org/" title="Go back to the home page"> Node.js </a> </div> <ul> <li><a href="https://nodejs.org/api/documentation.html" class="nav-documentation">About these Docs</a></li> <li><a href="https://nodejs.org/api/synopsis.html" class="nav-synopsis">Usage & Example</a></li> </ul> <div class="line"></div> <ul> <li><a href="https://nodejs.org/api/assert.html" class="nav-assert">Assertion Testing</a></li> <li><a href="https://nodejs.org/api/async_hooks.html" class="nav-async_hooks">Async Hooks</a></li> <li><a href="https://nodejs.org/api/buffer.html" class="nav-buffer">Buffer</a></li> <li><a href="https://nodejs.org/api/addons.html" class="nav-addons">C++ Addons</a></li> <li><a href="https://nodejs.org/api/n-api.html" class="nav-n-api">C/C++ Addons - N-API</a></li> <li><a href="https://nodejs.org/api/child_process.html" class="nav-child_process">Child Processes</a></li> <li><a href="https://nodejs.org/api/cluster.html" class="nav-cluster">Cluster</a></li> <li><a href="https://nodejs.org/api/cli.html" class="nav-cli">Command Line Options</a></li> <li><a href="https://nodejs.org/api/console.html" class="nav-console">Console</a></li> <li><a href="https://nodejs.org/api/crypto.html" class="nav-crypto">Crypto</a></li> <li><a href="https://nodejs.org/api/debugger.html" class="nav-debugger">Debugger</a></li> <li><a href="https://nodejs.org/api/deprecations.html" class="nav-deprecations">Deprecated APIs</a></li> <li><a href="https://nodejs.org/api/dns.html" class="nav-dns">DNS</a></li> <li><a href="https://nodejs.org/api/domain.html" class="nav-domain">Domain</a></li> <li><a href="https://nodejs.org/api/esm.html" class="nav-esm">ECMAScript Modules</a></li> <li><a href="https://nodejs.org/api/errors.html" class="nav-errors">Errors</a></li> <li><a href="https://nodejs.org/api/events.html" class="nav-events">Events</a></li> <li><a href="https://nodejs.org/api/fs.html" class="nav-fs">File System</a></li> <li><a href="https://nodejs.org/api/globals.html" class="nav-globals">Globals</a></li> <li><a href="https://nodejs.org/api/http.html" class="nav-http active">HTTP</a></li> <li><a href="https://nodejs.org/api/http2.html" class="nav-http2">HTTP/2</a></li> <li><a href="https://nodejs.org/api/https.html" class="nav-https">HTTPS</a></li> <li><a href="https://nodejs.org/api/inspector.html" class="nav-inspector">Inspector</a></li> <li><a href="https://nodejs.org/api/intl.html" class="nav-intl">Internationalization</a></li> <li><a href="https://nodejs.org/api/modules.html" class="nav-modules">Modules</a></li> <li><a href="https://nodejs.org/api/net.html" class="nav-net">Net</a></li> <li><a href="https://nodejs.org/api/os.html" class="nav-os">OS</a></li> <li><a href="https://nodejs.org/api/path.html" class="nav-path">Path</a></li> <li><a href="https://nodejs.org/api/perf_hooks.html" class="nav-perf_hooks">Performance Hooks</a></li> <li><a href="https://nodejs.org/api/policy.html" class="nav-policy">Policies</a></li> <li><a href="https://nodejs.org/api/process.html" class="nav-process">Process</a></li> <li><a href="https://nodejs.org/api/punycode.html" class="nav-punycode">Punycode</a></li> <li><a href="https://nodejs.org/api/querystring.html" class="nav-querystring">Query Strings</a></li> <li><a href="https://nodejs.org/api/readline.html" class="nav-readline">Readline</a></li> <li><a href="https://nodejs.org/api/repl.html" class="nav-repl">REPL</a></li> <li><a href="https://nodejs.org/api/report.html" class="nav-report">Report</a></li> <li><a href="https://nodejs.org/api/stream.html" class="nav-stream">Stream</a></li> <li><a href="https://nodejs.org/api/string_decoder.html" class="nav-string_decoder">String Decoder</a></li> <li><a href="https://nodejs.org/api/timers.html" class="nav-timers">Timers</a></li> <li><a href="https://nodejs.org/api/tls.html" class="nav-tls">TLS/SSL</a></li> <li><a href="https://nodejs.org/api/tracing.html" class="nav-tracing">Trace Events</a></li> <li><a href="https://nodejs.org/api/tty.html" class="nav-tty">TTY</a></li> <li><a href="https://nodejs.org/api/dgram.html" class="nav-dgram">UDP/Datagram</a></li> <li><a href="https://nodejs.org/api/url.html" class="nav-url">URL</a></li> <li><a href="https://nodejs.org/api/util.html" class="nav-util">Utilities</a></li> <li><a href="https://nodejs.org/api/v8.html" class="nav-v8">V8</a></li> <li><a href="https://nodejs.org/api/vm.html" class="nav-vm">VM</a></li> <li><a href="https://nodejs.org/api/worker_threads.html" class="nav-worker_threads">Worker Threads</a></li> <li><a href="https://nodejs.org/api/zlib.html" class="nav-zlib">Zlib</a></li> </ul> <div class="line"></div> <ul> <li><a href="https://github.com/nodejs/node" class="nav-https-github-com-nodejs-node">GitHub Repo & Issue Tracker</a></li> </ul> </div> <div id="column1" data-id="http" class="interior"> <header> <h1>Node.js v12.10.0 Documentation</h1> <div id="gtoc"> <ul> <li> <a href="https://nodejs.org/api/index.html" name="toc">Index</a> </li> <li> <a href="https://nodejs.org/api/all.html">View on single page</a> </li> <li> <a href="https://nodejs.org/api/http.json">View as JSON</a> </li> <li class="version-picker"> <a href="#">View another version <span>▼</span></a> <ol class="version-picker"><li><a href="https://nodejs.org/docs/latest-v12.x/api/http.html">12.x</a></li> <li><a href="https://nodejs.org/docs/latest-v11.x/api/http.html">11.x</a></li> <li><a href="https://nodejs.org/docs/latest-v10.x/api/http.html">10.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v9.x/api/http.html">9.x</a></li> <li><a href="https://nodejs.org/docs/latest-v8.x/api/http.html">8.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v7.x/api/http.html">7.x</a></li> <li><a href="https://nodejs.org/docs/latest-v6.x/api/http.html">6.x</a></li> <li><a href="https://nodejs.org/docs/latest-v5.x/api/http.html">5.x</a></li> <li><a href="https://nodejs.org/docs/latest-v4.x/api/http.html">4.x</a></li> <li><a href="https://nodejs.org/docs/latest-v0.12.x/api/http.html">0.12.x</a></li> <li><a href="https://nodejs.org/docs/latest-v0.10.x/api/http.html">0.10.x</a></li></ol> </li> <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/master/doc/api/http.md"><span class="github_icon"><svg height="16" width="16" viewBox="0 0 16.1 16.1" fill="currentColor"><path d="M8 0a8 8 0 0 0-2.5 15.6c.4 0 .5-.2.5-.4v-1.5c-2 .4-2.5-.5-2.7-1 0-.1-.5-.9-.8-1-.3-.2-.7-.6 0-.6.6 0 1 .6 1.2.8.7 1.2 1.9 1 2.4.7 0-.5.2-.9.5-1-1.8-.3-3.7-1-3.7-4 0-.9.3-1.6.8-2.2 0-.2-.3-1 .1-2 0 0 .7-.3 2.2.7a7.4 7.4 0 0 1 4 0c1.5-1 2.2-.8 2.2-.8.5 1.1.2 2 .1 2.1.5.6.8 1.3.8 2.2 0 3-1.9 3.7-3.6 4 .3.2.5.7.5 1.4v2.2c0 .2.1.5.5.4A8 8 0 0 0 16 8a8 8 0 0 0-8-8z"></path></svg></span>Edit on GitHub</a></li> </ul> </div> <hr> </header> <div id="toc"> <h2>Table of Contents</h2> <ul> <li> <p><span class="stability_2"><a href="#http_http">HTTP</a></span></p> <ul> <li> <p><a href="#http_class_http_agent">Class: http.Agent</a></p> <ul> <li><a href="#http_new_agent_options">new Agent([options])</a></li> <li><a href="#http_agent_createconnection_options_callback">agent.createConnection(options[, callback])</a></li> <li><a href="#http_agent_keepsocketalive_socket">agent.keepSocketAlive(socket)</a></li> <li><a href="#http_agent_reusesocket_socket_request">agent.reuseSocket(socket, request)</a></li> <li><a href="#http_agent_destroy">agent.destroy()</a></li> <li><a href="#http_agent_freesockets">agent.freeSockets</a></li> <li><a href="#http_agent_getname_options">agent.getName(options)</a></li> <li><a href="#http_agent_maxfreesockets">agent.maxFreeSockets</a></li> <li><a href="#http_agent_maxsockets">agent.maxSockets</a></li> <li><a href="#http_agent_requests">agent.requests</a></li> <li><a href="#http_agent_sockets">agent.sockets</a></li> </ul> </li> <li> <p><a href="#http_class_http_clientrequest">Class: http.ClientRequest</a></p> <ul> <li><a href="#http_event_abort">Event: 'abort'</a></li> <li><a href="#http_event_connect">Event: 'connect'</a></li> <li><a href="#http_event_continue">Event: 'continue'</a></li> <li><a href="#http_event_information">Event: 'information'</a></li> <li><a href="#http_event_response">Event: 'response'</a></li> <li><a href="#http_event_socket">Event: 'socket'</a></li> <li><a href="#http_event_timeout">Event: 'timeout'</a></li> <li><a href="#http_event_upgrade">Event: 'upgrade'</a></li> <li><a href="#http_request_abort">request.abort()</a></li> <li><a href="#http_request_aborted">request.aborted</a></li> <li><a href="#http_request_connection">request.connection</a></li> <li><a href="#http_request_end_data_encoding_callback">request.end([data[, encoding]][, callback])</a></li> <li><a href="#http_request_finished">request.finished</a></li> <li><a href="#http_request_flushheaders">request.flushHeaders()</a></li> <li><a href="#http_request_getheader_name">request.getHeader(name)</a></li> <li><a href="#http_request_maxheaderscount">request.maxHeadersCount</a></li> <li><a href="#http_request_path">request.path</a></li> <li><a href="#http_request_removeheader_name">request.removeHeader(name)</a></li> <li><a href="#http_request_setheader_name_value">request.setHeader(name, value)</a></li> <li><a href="#http_request_setnodelay_nodelay">request.setNoDelay([noDelay])</a></li> <li><a href="#http_request_setsocketkeepalive_enable_initialdelay">request.setSocketKeepAlive([enable][, initialDelay])</a></li> <li><a href="#http_request_settimeout_timeout_callback">request.setTimeout(timeout[, callback])</a></li> <li><a href="#http_request_socket">request.socket</a></li> <li><a href="#http_request_writableended">request.writableEnded</a></li> <li><a href="#http_request_writablefinished">request.writableFinished</a></li> <li><a href="#http_request_write_chunk_encoding_callback">request.write(chunk[, encoding][, callback])</a></li> </ul> </li> <li> <p><a href="#http_class_http_server">Class: http.Server</a></p> <ul> <li><a href="#http_event_checkcontinue">Event: 'checkContinue'</a></li> <li><a href="#http_event_checkexpectation">Event: 'checkExpectation'</a></li> <li><a href="#http_event_clienterror">Event: 'clientError'</a></li> <li><a href="#http_event_close">Event: 'close'</a></li> <li><a href="#http_event_connect_1">Event: 'connect'</a></li> <li><a href="#http_event_connection">Event: 'connection'</a></li> <li><a href="#http_event_request">Event: 'request'</a></li> <li><a href="#http_event_upgrade_1">Event: 'upgrade'</a></li> <li><a href="#http_server_close_callback">server.close([callback])</a></li> <li><a href="#http_server_headerstimeout">server.headersTimeout</a></li> <li><a href="#http_server_listen">server.listen()</a></li> <li><a href="#http_server_listening">server.listening</a></li> <li><a href="#http_server_maxheaderscount">server.maxHeadersCount</a></li> <li><a href="#http_server_settimeout_msecs_callback">server.setTimeout([msecs][, callback])</a></li> <li><a href="#http_server_timeout">server.timeout</a></li> <li><a href="#http_server_keepalivetimeout">server.keepAliveTimeout</a></li> </ul> </li> <li> <p><a href="#http_class_http_serverresponse">Class: http.ServerResponse</a></p> <ul> <li><a href="#http_event_close_1">Event: 'close'</a></li> <li><a href="#http_event_finish">Event: 'finish'</a></li> <li><a href="#http_response_addtrailers_headers">response.addTrailers(headers)</a></li> <li><a href="#http_response_connection">response.connection</a></li> <li><a href="#http_response_end_data_encoding_callback">response.end([data][, encoding][, callback])</a></li> <li><a href="#http_response_finished">response.finished</a></li> <li><a href="#http_response_flushheaders">response.flushHeaders()</a></li> <li><a href="#http_response_getheader_name">response.getHeader(name)</a></li> <li><a href="#http_response_getheadernames">response.getHeaderNames()</a></li> <li><a href="#http_response_getheaders">response.getHeaders()</a></li> <li><a href="#http_response_hasheader_name">response.hasHeader(name)</a></li> <li><a href="#http_response_headerssent">response.headersSent</a></li> <li><a href="#http_response_removeheader_name">response.removeHeader(name)</a></li> <li><a href="#http_response_senddate">response.sendDate</a></li> <li><a href="#http_response_setheader_name_value">response.setHeader(name, value)</a></li> <li><a href="#http_response_settimeout_msecs_callback">response.setTimeout(msecs[, callback])</a></li> <li><a href="#http_response_socket">response.socket</a></li> <li><a href="#http_response_statuscode">response.statusCode</a></li> <li><a href="#http_response_statusmessage">response.statusMessage</a></li> <li><a href="#http_response_writableended">response.writableEnded</a></li> <li><a href="#http_response_writablefinished">response.writableFinished</a></li> <li><a href="#http_response_write_chunk_encoding_callback">response.write(chunk[, encoding][, callback])</a></li> <li><a href="#http_response_writecontinue">response.writeContinue()</a></li> <li><a href="#http_response_writehead_statuscode_statusmessage_headers">response.writeHead(statusCode[, statusMessage][, headers])</a></li> <li><a href="#http_response_writeprocessing">response.writeProcessing()</a></li> </ul> </li> <li> <p><a href="#http_class_http_incomingmessage">Class: http.IncomingMessage</a></p> <ul> <li><a href="#http_event_aborted">Event: 'aborted'</a></li> <li><a href="#http_event_close_2">Event: 'close'</a></li> <li><a href="#http_message_aborted">message.aborted</a></li> <li><a href="#http_message_complete">message.complete</a></li> <li><a href="#http_message_destroy_error">message.destroy([error])</a></li> <li><a href="#http_message_headers">message.headers</a></li> <li><a href="#http_message_httpversion">message.httpVersion</a></li> <li><a href="#http_message_method">message.method</a></li> <li><a href="#http_message_rawheaders">message.rawHeaders</a></li> <li><a href="#http_message_rawtrailers">message.rawTrailers</a></li> <li><a href="#http_message_settimeout_msecs_callback">message.setTimeout(msecs, callback)</a></li> <li><a href="#http_message_socket">message.socket</a></li> <li><a href="#http_message_statuscode">message.statusCode</a></li> <li><a href="#http_message_statusmessage">message.statusMessage</a></li> <li><a href="#http_message_trailers">message.trailers</a></li> <li><a href="#http_message_url">message.url</a></li> </ul> </li> <li><a href="#http_http_methods">http.METHODS</a></li> <li><a href="#http_http_status_codes">http.STATUS_CODES</a></li> <li><a href="#http_http_createserver_options_requestlistener">http.createServer([options][, requestListener])</a></li> <li><a href="#http_http_get_options_callback">http.get(options[, callback])</a></li> <li><a href="#http_http_get_url_options_callback">http.get(url[, options][, callback])</a></li> <li><a href="#http_http_globalagent">http.globalAgent</a></li> <li><a href="#http_http_maxheadersize">http.maxHeaderSize</a></li> <li><a href="#http_http_request_options_callback">http.request(options[, callback])</a></li> <li><a href="#http_http_request_url_options_callback">http.request(url[, options][, callback])</a></li> </ul> </li> </ul> </div> <div id="apicontent"> <h1>HTTP<span><a class="mark" href="#http_http" id="http_http">#</a></span></h1> <p></p><div class="api_stability api_stability_2"><a href="https://nodejs.org/api/documentation.html#documentation_stability_index">Stability: 2</a> - Stable</div><p></p> <p>To use the HTTP server and client one must <code>require('http')</code>.</p> <p>The HTTP interfaces in Node.js are designed to support many features of the protocol which have been traditionally difficult to use. In particular, large, possibly chunk-encoded, messages. The interface is careful to never buffer entire requests or responses — the user is able to stream data.</p> <p>HTTP message headers are represented by an object like this:</p>  <pre><code class="language-js">{ 'content-length': '123', 'content-type': 'text/plain', 'connection': 'keep-alive', 'host': 'mysite.com', 'accept': '*/*' } </code></pre> <p>Keys are lowercased. Values are not modified.</p> <p>In order to support the full spectrum of possible HTTP applications, Node.js's HTTP API is very low-level. It deals with stream handling and message parsing only. It parses a message into headers and body but it does not parse the actual headers or the body.</p> <p>See <a href="#http_message_headers"><code>message.headers</code></a> for details on how duplicate headers are handled.</p> <p>The raw headers as they were received are retained in the <code>rawHeaders</code> property, which is an array of <code>[key, value, key2, value2, ...]</code>. For example, the previous message header object might have a <code>rawHeaders</code> list like the following:</p>  <pre><code class="language-js">[ 'ConTent-Length', '123456', 'content-LENGTH', '123', 'content-type', 'text/plain', 'CONNECTION', 'keep-alive', 'Host', 'mysite.com', 'accepT', '*/*' ] </code></pre> <h2>Class: http.Agent<span><a class="mark" href="#http_class_http_agent" id="http_class_http_agent">#</a></span></h2> <div class="api_metadata"> <span>Added in: v0.3.4</span> </div> <p>An <code>Agent</code> is responsible for managing connection persistence and reuse for HTTP clients. It maintains a queue of pending requests for a given host and port, reusing a single socket connection for each until the queue is empty, at which time the socket is either destroyed or put into a pool where it is kept to be used again for requests to the same host and port. Whether it is destroyed or pooled depends on the <code>keepAlive</code> <a href="#http_new_agent_options">option</a>.</p> <p>Pooled connections have TCP Keep-Alive enabled for them, but servers may still close idle connections, in which case they will be removed from the pool and a new connection will be made when a new HTTP request is made for that host and port. Servers may also refuse to allow multiple requests over the same connection, in which case the connection will have to be remade for every request and cannot be pooled. The <code>Agent</code> will still make the requests to that server, but each one will occur over a new connection.</p> <p>When a connection is closed by the client or the server, it is removed from the pool. Any unused sockets in the pool will be unrefed so as not to keep the Node.js process running when there are no outstanding requests. (see <a href="https://nodejs.org/api/net.html#net_socket_unref"><code>socket.unref()</code></a>).</p> <p>It is good practice, to <a href="#http_agent_destroy"><code>destroy()</code></a> an <code>Agent</code> instance when it is no longer in use, because unused sockets consume OS resources.</p> <p>Sockets are removed from an agent when the socket emits either a <code>'close'</code> event or an <code>'agentRemove'</code> event. When intending to keep one HTTP request open for a long time without keeping it in the agent, something like the following may be done:</p> <pre><code class="language-js">http.get(options, (res) => { // Do stuff }).on('socket', (socket) => { socket.emit('agentRemove'); }); </code></pre> <p>An agent may also be used for an individual request. By providing <code>{agent: false}</code> as an option to the <code>http.get()</code> or <code>http.request()</code> functions, a one-time use <code>Agent</code> with default options will be used for the client connection.</p> <p><code>agent:false</code>:</p> <pre><code class="language-js">http.get({ hostname: 'localhost', port: 80, path: '/', agent: false // Create a new agent just for this one request }, (res) => { // Do stuff with response }); </code></pre> <h3>new Agent([options])<span><a class="mark" href="#http_new_agent_options" id="http_new_agent_options">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.3.4</span> </div> <ul> <li> <p><code>options</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a> Set of configurable options to set on the agent. Can have the following fields:</p> <ul> <li><code>keepAlive</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> Keep sockets around even when there are no outstanding requests, so they can be used for future requests without having to reestablish a TCP connection. Not to be confused with the <code>keep-alive</code> value of the <code>Connection</code> header. The <code>Connection: keep-alive</code> header is always sent when using an agent except when the <code>Connection</code> header is explicitly specified or when the <code>keepAlive</code> and <code>maxSockets</code> options are respectively set to <code>false</code> and <code>Infinity</code>, in which case <code>Connection: close</code> will be used. <strong>Default:</strong> <code>false</code>.</li> <li><code>keepAliveMsecs</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a> When using the <code>keepAlive</code> option, specifies the <a href="https://nodejs.org/api/net.html#net_socket_setkeepalive_enable_initialdelay">initial delay</a> for TCP Keep-Alive packets. Ignored when the <code>keepAlive</code> option is <code>false</code> or <code>undefined</code>. <strong>Default:</strong> <code>1000</code>.</li> <li><code>maxSockets</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a> Maximum number of sockets to allow per host. Each request will use a new socket until the maximum is reached. <strong>Default:</strong> <code>Infinity</code>.</li> <li><code>maxFreeSockets</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a> Maximum number of sockets to leave open in a free state. Only relevant if <code>keepAlive</code> is set to <code>true</code>. <strong>Default:</strong> <code>256</code>.</li> <li><code>timeout</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a> Socket timeout in milliseconds. This will set the timeout when the socket is created.</li> </ul> </li> </ul> <p><code>options</code> in <a href="https://nodejs.org/api/net.html#net_socket_connect_options_connectlistener"><code>socket.connect()</code></a> are also supported.</p> <p>The default <a href="#http_http_globalagent"><code>http.globalAgent</code></a> that is used by <a href="#http_http_request_options_callback"><code>http.request()</code></a> has all of these values set to their respective defaults.</p> <p>To configure any of them, a custom <a href="#http_class_http_agent"><code>http.Agent</code></a> instance must be created.</p> <pre><code class="language-js">const http = require('http'); const keepAliveAgent = new http.Agent({ keepAlive: true }); options.agent = keepAliveAgent; http.request(options, onResponseCallback); </code></pre> <h3>agent.createConnection(options[, callback])<a class="srclink" href="https://github.com/nodejs/node/blob/3a2e75d9a5c31d20e429d505b82dd182e33f459a/lib/https.js#L95">[src]</a><span><a class="mark" href="#http_agent_createconnection_options_callback" id="http_agent_createconnection_options_callback">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.11.4</span> </div> <ul> <li><code>options</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a> Options containing connection details. Check <a href="https://nodejs.org/api/net.html#net_net_createconnection_options_connectlistener"><code>net.createConnection()</code></a> for the format of the options</li> <li><code>callback</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function" class="type"><Function></a> Callback function that receives the created socket</li> <li>Returns: <a href="https://nodejs.org/api/net.html#net_class_net_socket" class="type"><net.Socket></a></li> </ul> <p>Produces a socket/stream to be used for HTTP requests.</p> <p>By default, this function is the same as <a href="https://nodejs.org/api/net.html#net_net_createconnection_options_connectlistener"><code>net.createConnection()</code></a>. However, custom agents may override this method in case greater flexibility is desired.</p> <p>A socket/stream can be supplied in one of two ways: by returning the socket/stream from this function, or by passing the socket/stream to <code>callback</code>.</p> <p><code>callback</code> has a signature of <code>(err, stream)</code>.</p> <h3>agent.keepSocketAlive(socket)<a class="srclink" href="https://github.com/nodejs/node/blob/3a2e75d9a5c31d20e429d505b82dd182e33f459a/lib/_http_agent.js#L326">[src]</a><span><a class="mark" href="#http_agent_keepsocketalive_socket" id="http_agent_keepsocketalive_socket">#</a></span></h3> <div class="api_metadata"> <span>Added in: v8.1.0</span> </div> <ul> <li><code>socket</code> <a href="https://nodejs.org/api/net.html#net_class_net_socket" class="type"><net.Socket></a></li> </ul> <p>Called when <code>socket</code> is detached from a request and could be persisted by the <code>Agent</code>. Default behavior is to:</p> <pre><code class="language-js">socket.setKeepAlive(true, this.keepAliveMsecs); socket.unref(); return true; </code></pre> <p>This method can be overridden by a particular <code>Agent</code> subclass. If this method returns a falsy value, the socket will be destroyed instead of persisting it for use with the next request.</p> <h3>agent.reuseSocket(socket, request)<a class="srclink" href="https://github.com/nodejs/node/blob/3a2e75d9a5c31d20e429d505b82dd182e33f459a/lib/_http_agent.js#L333">[src]</a><span><a class="mark" href="#http_agent_reusesocket_socket_request" id="http_agent_reusesocket_socket_request">#</a></span></h3> <div class="api_metadata"> <span>Added in: v8.1.0</span> </div> <ul> <li><code>socket</code> <a href="https://nodejs.org/api/net.html#net_class_net_socket" class="type"><net.Socket></a></li> <li><code>request</code> <a href="https://nodejs.org/api/http.html#http_class_http_clientrequest" class="type"><http.ClientRequest></a></li> </ul> <p>Called when <code>socket</code> is attached to <code>request</code> after being persisted because of the keep-alive options. Default behavior is to:</p> <pre><code class="language-js">socket.ref(); </code></pre> <p>This method can be overridden by a particular <code>Agent</code> subclass.</p> <h3>agent.destroy()<a class="srclink" href="https://github.com/nodejs/node/blob/3a2e75d9a5c31d20e429d505b82dd182e33f459a/lib/_http_agent.js#L338">[src]</a><span><a class="mark" href="#http_agent_destroy" id="http_agent_destroy">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.11.4</span> </div> <p>Destroy any sockets that are currently in use by the agent.</p> <p>It is usually not necessary to do this. However, if using an agent with <code>keepAlive</code> enabled, then it is best to explicitly shut down the agent when it will no longer be used. Otherwise, sockets may hang open for quite a long time before the server terminates them.</p> <h3>agent.freeSockets<span><a class="mark" href="#http_agent_freesockets" id="http_agent_freesockets">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.11.4</span> </div> <ul> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li> </ul> <p>An object which contains arrays of sockets currently awaiting use by the agent when <code>keepAlive</code> is enabled. Do not modify.</p> <h3>agent.getName(options)<a class="srclink" href="https://github.com/nodejs/node/blob/3a2e75d9a5c31d20e429d505b82dd182e33f459a/lib/https.js#L164">[src]</a><span><a class="mark" href="#http_agent_getname_options" id="http_agent_getname_options">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.11.4</span> </div> <ul> <li> <p><code>options</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a> A set of options providing information for name generation</p> <ul> <li><code>host</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> A domain name or IP address of the server to issue the request to</li> <li><code>port</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a> Port of remote server</li> <li><code>localAddress</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> Local interface to bind for network connections when issuing the request</li> <li><code>family</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><integer></a> Must be 4 or 6 if this doesn't equal <code>undefined</code>.</li> </ul> </li> <li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> </ul> <p>Get a unique name for a set of request options, to determine whether a connection can be reused. For an HTTP agent, this returns <code>host:port:localAddress</code> or <code>host:port:localAddress:family</code>. For an HTTPS agent, the name includes the CA, cert, ciphers, and other HTTPS/TLS-specific options that determine socket reusability.</p> <h3>agent.maxFreeSockets<span><a class="mark" href="#http_agent_maxfreesockets" id="http_agent_maxfreesockets">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.11.7</span> </div> <ul> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li> </ul> <p>By default set to 256. For agents with <code>keepAlive</code> enabled, this sets the maximum number of sockets that will be left open in the free state.</p> <h3>agent.maxSockets<span><a class="mark" href="#http_agent_maxsockets" id="http_agent_maxsockets">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.3.6</span> </div> <ul> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li> </ul> <p>By default set to <code>Infinity</code>. Determines how many concurrent sockets the agent can have open per origin. Origin is the returned value of <a href="#http_agent_getname_options"><code>agent.getName()</code></a>.</p> <h3>agent.requests<span><a class="mark" href="#http_agent_requests" id="http_agent_requests">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.5.9</span> </div> <ul> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li> </ul> <p>An object which contains queues of requests that have not yet been assigned to sockets. Do not modify.</p> <h3>agent.sockets<span><a class="mark" href="#http_agent_sockets" id="http_agent_sockets">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.3.6</span> </div> <ul> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li> </ul> <p>An object which contains arrays of sockets currently in use by the agent. Do not modify.</p> <h2>Class: http.ClientRequest<span><a class="mark" href="#http_class_http_clientrequest" id="http_class_http_clientrequest">#</a></span></h2> <div class="api_metadata"> <span>Added in: v0.1.17</span> </div> <ul> <li>Extends: <a href="https://nodejs.org/api/stream.html#stream_stream" class="type"><Stream></a></li> </ul> <p>This object is created internally and returned from <a href="#http_http_request_options_callback"><code>http.request()</code></a>. It represents an <em>in-progress</em> request whose header has already been queued. The header is still mutable using the <a href="#http_request_setheader_name_value"><code>setHeader(name, value)</code></a>, <a href="#http_request_getheader_name"><code>getHeader(name)</code></a>, <a href="#http_request_removeheader_name"><code>removeHeader(name)</code></a> API. The actual header will be sent along with the first data chunk or when calling <a href="#http_request_end_data_encoding_callback"><code>request.end()</code></a>.</p> <p>To get the response, add a listener for <a href="#http_event_response"><code>'response'</code></a> to the request object. <a href="#http_event_response"><code>'response'</code></a> will be emitted from the request object when the response headers have been received. The <a href="#http_event_response"><code>'response'</code></a> event is executed with one argument which is an instance of <a href="#http_class_http_incomingmessage"><code>http.IncomingMessage</code></a>.</p> <p>During the <a href="#http_event_response"><code>'response'</code></a> event, one can add listeners to the response object; particularly to listen for the <code>'data'</code> event.</p> <p>If no <a href="#http_event_response"><code>'response'</code></a> handler is added, then the response will be entirely discarded. However, if a <a href="#http_event_response"><code>'response'</code></a> event handler is added, then the data from the response object <strong>must</strong> be consumed, either by calling <code>response.read()</code> whenever there is a <code>'readable'</code> event, or by adding a <code>'data'</code> handler, or by calling the <code>.resume()</code> method. Until the data is consumed, the <code>'end'</code> event will not fire. Also, until the data is read it will consume memory that can eventually lead to a 'process out of memory' error.</p> <p>Unlike the <code>request</code> object, if the response closes prematurely, the <code>response</code> object does not emit an <code>'error'</code> event but instead emits the <code>'aborted'</code> event.</p> <p>Node.js does not check whether Content-Length an