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<body class="article toc2 toc-left">
<div id="header">
<h1>cockpit.js: HTTP Client</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#cockpit-http-constructor">cockpit.http()</a></li>
<li><a href="#cockpit-http-get">http.get()</a></li>
<li><a href="#cockpit-http-post">http.post()</a></li>
<li><a href="#cockpit-http-request">http.request()</a></li>
<li><a href="#cockpit-http-then">request.then()</a></li>
<li><a href="#cockpit-http-catch">request.catch()</a></li>
<li><a href="#cockpit-http-response">request.response()</a></li>
<li><a href="#cockpit-http-stream">request.stream()</a></li>
<li><a href="#cockpit-http-input">request.input()</a></li>
<li><a href="#cockpit-http-close">request.close()</a></li>
<li><a href="#cockpit-http-close-all">http.close()</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Cockpit allows access to local HTTP and REST services via this API.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-constructor">cockpit.http()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>http = cockpit.http(endpoint, [options])
http = cockpit.http(options)</pre>
</div>
</div>
<div class="paragraph">
<p>Create a new HTTP client. The <code>endpoint</code> can be a file path starting
with <code>/</code> to connect to a unix socket, or it can be a port number to
connect to. The optional <code>options</code> argument is a javascript plain
object, and may include:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1"><code>"address"</code></dt>
<dd>
<p>Connect to an address other than localhost. Must be a valid host name
or IP address. To use this option you also must provide a port number.</p>
</dd>
<dt class="hdlist1"><code>"port"</code></dt>
<dd>
<p>Port number to use with "address" option, when not given in
<code>endpoint</code>.</p>
</dd>
<dt class="hdlist1"><code>"tls"</code></dt>
<dd>
<p>Object properties for an https connection. See
<code>http-stream2 TLS options</code>.</p>
</dd>
<dt class="hdlist1"><code>"headers"</code></dt>
<dd>
<p>Additional HTTP headers to include with the HTTP request. This is a
plain javascript object with each key as a header name, and each value
as the header value.</p>
</dd>
<dt class="hdlist1"><code>"superuser"</code></dt>
<dd>
<p>Set to <code>"require"</code> to open this channel as root. If the currently
logged in user is not permitted to become root (eg: via <code>pkexec</code>)
then the <code>channel</code> will immediately be
<a href="#cockpit-channels-close-ev">closed</a> with a <code>"access-denied"</code>
problem code.
+
Set to <code>"try"</code> to try to make the request as root, but if that
fails, fall back to perform an unprivileged request.</p>
</dd>
<dt class="hdlist1"><code>"tls"</code></dt>
<dd>
<p>If set to a plain javascript object, then the connection will be an
HTTPS connection and include TLS encryption. The fields of the <code>tls</code>
object declare various TLS configuration and data. All fields are
optional:
+</p>
<div class="ulist">
<ul>
<li>
<p><code>"authority"</code>: Certificate authority(s) to expect as signers of
the server’s TLS certificate, represented as a plain javascript
object. It should have either a <code>"file"</code> field containing a readable
PEM file on the system containing authorities, or a <code>"data"</code> with
PEM encoded certificate data.</p>
</li>
<li>
<p><code>"certificate"</code>: A client certificate to use, represented as a
plain javascript object. It should have either a <code>"file"</code> field
containing a readable PEM file on the system to use as a certificate,
or a <code>"data"</code> with PEM encoded certificate data.</p>
</li>
<li>
<p><code>"key"</code>: A client key to use, represented as a plain javascript
object. It should have either a <code>"file"</code> field containing a readable
PEM file on the system to use as a key, or a <code>"data"</code> with PEM
encoded key data.</p>
</li>
<li>
<p><code>"validate"</code>: A boolean that describes whether to validate the
server’s TLS certificate or not. By default local connections are not
validated, and remote connections are validated.</p>
</li>
</ul>
</div>
</dd>
</dl>
</div>
<div class="paragraph">
<p>Here is a somewhat complex example of using most of the above
<code>options</code> when when calling <code>cockpit.http()</code>:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>http = cockpit.http({
"address": "localhost",
"headers": {
"Authorization": "Basic dXNlcjpwYXNzd29yZA=="
},
"port": 443,
"tls": {
"validate": true,
"authority": {
"file": "/etc/pki/tls/certs/ca-bundle.crt",
},
"certificate": {
"data": "-----BEGIN CERTIFICATE-----\nMIIDsDCCA..."
},
"key": {
"data": "-----BEGIN RSA PRIVATE KEY-----\nMIIEogIBA..."
}
}
});</pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-get">http.get()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>request = http.get(path, [params, [headers]])</pre>
</div>
</div>
<div class="paragraph">
<p>Perform an HTTP GET request for the given <code>path</code>. If the <code>params</code> is
specified it should be a plain javascript object, which will be turned
into a query string.</p>
</div>
<div class="paragraph">
<p>Optionally a plain javascript object containing headers can be included
in the <code>headers</code> argument.</p>
</div>
<div class="paragraph">
<p>The return value is a
<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a>
that will complete if the request happens successfully, or fail if
there’s a problem.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-post">http.post()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>request = http.post(path, body, [headers])</pre>
</div>
</div>
<div class="paragraph">
<p>Perform an HTTP POST request for the given <code>path</code>. The <code>body</code> can be
a string, or a javascript plain object, which will be encoded as JSON
data. If <code>body</code> is <code>undefined</code> or <code>null</code> then an empty HTTP body
will be sent.</p>
</div>
<div class="paragraph">
<p>Optionally a plain javascript object containing headers can be included
in the <code>headers</code> argument.</p>
</div>
<div class="paragraph">
<p>The return value is a
<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a>
that will complete if the request happens successfully, or fail if
there’s a problem.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-request">http.request()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>request = http.request(options)</pre>
</div>
</div>
<div class="paragraph">
<p>Perform an HTTP request. The <code>options</code> can contain the following:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1"><code>"body"</code></dt>
<dd>
<p>The HTTP request body. If you do not specify a body, then you must
call <a href="#cockpit-http-input">request.input()</a> to complete the body
and allow the request to start.</p>
</dd>
<dt class="hdlist1"><code>"headers"</code></dt>
<dd>
<p>A javascript plain object containing HTTP headers.</p>
</dd>
<dt class="hdlist1"><code>"method"</code></dt>
<dd>
<p>The HTTP method. Defaults to <code>"GET"</code>.</p>
</dd>
<dt class="hdlist1"><code>"params"</code></dt>
<dd>
<p>A javascript plain object containing query string parameters.</p>
</dd>
<dt class="hdlist1"><code>"path"</code></dt>
<dd>
<p>The HTTP path. Defaults to <code>/</code>.</p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>The return value is a
<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a>
that will complete if the request happens successfully, or fail if
there’s a problem.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-then">request.then()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>request.then(data => { ... })</pre>
</div>
</div>
<div class="paragraph">
<p>This is a standard
<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a>
method. It sets up a handler to be called when the request finishes
successfully.</p>
</div>
<div class="paragraph">
<p>The <code>data</code> argument contains the body result of the request. If it a
string, unless the process was opened in binary mode, in which case the
<code>data</code> is an array of bytes. If a <code>request.stream()</code> handler is set
up, then any standard output data consumed by the handler will not be
included in the <code>data</code> argument.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-catch">request.catch()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>request.catch((exception[, data]) => { ... })</pre>
</div>
</div>
<div class="paragraph">
<p>This is a standard
<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a>
method. It sets up a handler to be called when the request fails, or
returns an error code.</p>
</div>
<div class="paragraph">
<p>The <code>exception</code> object passed to the handler can have the following
fields:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1"><code>problem</code></dt>
<dd>
<p>A <a href="#cockpit-problems">problem code</a> string when a problem occurred
starting or communicating with the server. This is <code>null</code> if the
process exited or was terminated.</p>
</dd>
<dt class="hdlist1"><code>status</code></dt>
<dd>
<p>The numeric status of the response. This is <code>null</code> if no response
was received.</p>
</dd>
<dt class="hdlist1"><code>reason</code></dt>
<dd>
<p>A string reason returned in the response. This is <code>null</code> if no
response was received.</p>
</dd>
<dt class="hdlist1"><code>message</code></dt>
<dd>
<p>A string message returned in the response. This is <code>null</code> if no
response was received.</p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>If the request returned a response body, it will be available in the
<code>data</code> argument. Otherwise this argument will be <code>undefined</code>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-response">request.response()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>request.response((status, headers) => { ... })</pre>
</div>
</div>
<div class="paragraph">
<p>This sets up a handler to be called when the HTTP request gets the
initial response from the server. The <code>status</code> argument is the HTTP
status integer, and the <code>headers</code> is a plain javascript object
containing the headers of the response.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-stream">request.stream()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>request.stream(data => { ... })</pre>
</div>
</div>
<div class="paragraph">
<p>This sets up a handler to be called when the request returns output
data. The handler will be called multiple times.</p>
</div>
<div class="paragraph">
<p>Only one handler may be registered at a time. Registering an additional
handler replaces the previous one. The handler receives either string
<code>data</code> or an array of binary bytes as its argument. A stream handler
may return a number, which indicates the number of characters or bytes
consumed from <code>data</code>. Any data not consumed will be included again the
next time the handler is called.</p>
</div>
<div class="paragraph">
<p>If a <code>request.stream()</code> handler is set up, then the <code>request.then()</code>
handlers will only get any remaining data not consumed by the stream
handler.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-input">request.input()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>request.input(data, [stream])</pre>
</div>
</div>
<div class="paragraph">
<p>This method writes <code>data</code> to the HTTP request body. It is only valid
if no <code>"body"</code> has been specified in
<a href="#cockpit-http-request">http.request()</a> options. If <code>stream</code> is
<code>true</code> then this function can be called again to provide further data.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-close">request.close()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>request.close([problem])</pre>
</div>
</div>
<div class="paragraph">
<p>Cancel the request. If <code>problem</code> is specified it should be a standard
<a href="#cockpit-problems">problem code</a> string.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="cockpit-http-close-all">http.close()</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>http.close([problem])</pre>
</div>
</div>
<div class="paragraph">
<p>Cancel all outstanding requests with the given problem code. This is
useful when you know that the server is going down soon.</p>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2026-01-28 11:12:25 UTC
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