node-red/nodes/core/io/21-httprequest.html

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<script type="text/x-red" data-help-name="http request">
    <p>Sends HTTP requests and returns the response.</p>

    <h3>Inputs</h3>
    <dl class="message-properties">
        <dt class="optional">url <span class="property-type">string</span></dt>
        <dd>If not configured in the node, this optional property sets the url of the request.</dd>
        <dt class="optional">method <span class="property-type">string</span></dt>
        <dd>If not configured in the node, this optional property sets the HTTP method of the request.
            Must be one of <code>GET</code>, <code>PUT</code>, <code>POST</code>, <code>PATCH</code> or <code>DELETE</code>.</dd>
        <dt class="optional">headers <span class="property-type">object</span></dt>
        <dd>Sets the HTTP headers of the request.</dd>
        <dt class="optional">cookies <span class="property-type">object</span></dt>
        <dd>If set, can be used to send cookies with the request.</dd>
        <dt class="optional">payload</dt>
        <dd>Sent as the body of the request.</dd>
        <dt class="optional">rejectUnauthorized</dt>
        <dd>If set to <code>false</code>, allows requests to be made to https sites that use
            self signed certificates.</dd>
        <dt class="optional">followRedirects</dt>
        <dd>If set to <code>false</code> prevent following Redirect (HTTP 301).<code>true</code> by default</dd>
    </dl>
    <h3>Outputs</h3>
    <dl class="message-properties">
        <dt>payload <span class="property-type">string | object | buffer</span></dt>
        <dd>The body of the response. The node can be configured to return the body
             as a string, attempt to parse it as a JSON string or leave it as a
             binary buffer.</dd>
        <dt>statusCode <span class="property-type">number</span></dt>
        <dd>The status code of the response, or the error code if the request could not be completed.</dd>
        <dt>headers <span class="property-type">object</span></dt>
        <dd>An object containing the response headers.</dd>
        <dt>responseUrl <span class="property-type">string</span></dt>
        <dd>In case any redirects occurred while processing the request, this property is the final redirected url.
            Otherwise, the url of the original request.</dd>
        <dt>responseCookies <span class="property-type">object</span></dt>
        <dd>If the response includes cookies, this propery is an object of name/value pairs for each cookie.</dd>
    </dl>
    <h3>Details</h3>
    <p>When configured within the node, the URL property can contain <a href="http://mustache.github.io/mustache.5.html" target="_blank">mustache-style</a> tags. These allow the
    url to be constructed using values of the incoming message. For example, if the url is set to
    <code>example.com/{{{topic}}}</code>, it will have the value of <code>msg.topic</code> automatically inserted.
    Using {{{...}}} prevents mustache from escaping characters like / & etc.</p>
    <p><b>Note</b>: If running behind a proxy, the standard <code>http_proxy=...</code> environment variable should be set and Node-RED restarted.</p>
    <h4>Using multiple HTTP Request nodes</h4>
    <p>In order to use more than one of these nodes in the same flow, care must be taken with
    the <code>msg.headers</code> property. The first node will set this property with
    the response headers. The next node will then use those headers for its request - this
    is not usually the right thing to do. If <code>msg.headers</code> property is left unchanged
    between nodes, it will be ignored by the second node. To set custom headers, <code>msg.headers</code>
    should first be deleted or reset to an empty object: <code>{}</code>.
    <h4>Cookie handling</h4>
    <p>The <code>cookies</code> property passed to the node must be an object of name/value pairs.
    The value can be either a string to set the value of the cookie or it can be an
    object with a single <code>value</code> property.<p>
    <p>Any cookies returned by the request are passed back under the <code>responseCookies</code> property.</p>
    <h4>Content type handling</h4>
    <p>If <code>msg.payload</code> is an Object, the node will automatically set the content type
    of the request to <code>application/json</code> and encode the body as such.</p>
    <p>To encode the request as form data, <code>msg.headers["content-type"]</code> should be set to <code>application/x-www-form-urlencoded</code>.</p>
    <p>For form-based file uploads, some services require that <code>msg.headers["content-type"]</code> be set to <code>multipart/form-data</code>.
    To construct <code>msg.payload</code> for this type of request, use the following structure and substitue the <code>KEY</code>, <code>DATA</code>, and <code>FILENAME</code> 
    values for your own.
<pre><code>msg.headers = {'content-type':'multipart/form-data'}

msg.payload = { 
    KEY: { 
        value: DATA, 
        options: { 
            filename: ‘FILENAME’ 
        } 
    } 
}
</code></pre>
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