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<header class="post-header">
<h1 class="post-title" itemprop="name headline">Integration of HTTP endpoints/webhooks</h1>
<p class="post-meta">Published by <img src="https://www.gravatar.com/avatar/19a9fd49b6778aef898249fb4f11bd24?s=135" alt="A photo of Thomas Jäckle" style="width:50px;border-radius:50%;display:inline-block;margin-right:5px;" /><span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name"><a href="https://github.com/thjaeckle" target="_blank">Thomas Jäckle</a> </span></span> on <time datetime="2019-10-17T00:00:00+00:00" itemprop="datePublished">Oct 17, 2019</time> - Tags:
<a href="tag_blog.html">blog</a>
</p>
</header>
<div class="post-content" itemprop="articleBody">
<p>By adding another connectivity type - <a href="connectivity-protocol-bindings-http.html">HTTP</a> - to Ditto’s
connectivity, it is now (to be released in the next Ditto milestone 1.0.0-M2) possible to
publish <em>twin events</em>, <em>messages</em>, <em>live commands and events</em> to existing HTTP servers/endpoints.</p>
<p>That is especially useful for invoking existing APIs (which are most of the time HTTP based) whenever e.g.
a digital twin was modified.</p>
<p>One example on how to benefit from this new feature is to invoke a custom
<a href="https://ifttt.com">IFTTT</a> (if-this-than-that) <a href="https://ifttt.com/maker_webhooks">webhook</a> via a HTTP <code class="highlighter-rouge">POST</code> request
which then may trigger other IFTTT follow-up-actions (e.g. send a chat message to a <a href="https://ifttt.com/slack">Slack</a>
room).</p>
<p>For IFTTT “webhooks” the address would be <code class="highlighter-rouge">POST https://maker.ifttt.com/trigger/&lt;your-event-name&gt;/with/key/&lt;your-key&gt;</code>
and the expected JSON body:</p>
<div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w">
</span><span class="s2">"value1"</span><span class="p">:</span><span class="w"> </span><span class="s2">"..."</span><span class="p">,</span><span class="w">
</span><span class="s2">"value2"</span><span class="p">:</span><span class="w"> </span><span class="s2">"..."</span><span class="p">,</span><span class="w">
</span><span class="s2">"value3"</span><span class="p">:</span><span class="w"> </span><span class="s2">"..."</span><span class="w">
</span><span class="p">}</span><span class="w">
</span></code></pre></div></div>
<p>In combination with <a href="connectivity-mapping.html">payload mapping</a>, the <code class="highlighter-rouge">value1</code> to <code class="highlighter-rouge">value3</code> fields requested by the IFTTT
API can be extracted from the <a href="protocol-specification.html">Ditto Protocol</a> and could contain the changed value.</p>
<p>In combination with <a href="basic-connections.html#target-topics-and-filtering">filters for targets</a> you can even specify to
only publish e.g. <code class="highlighter-rouge">twin events</code>, where the temperature of a twin exceeded a certain threshold:</p>
<div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>{
"address": "POST:/trigger/&lt;your-event-name&gt;/with/key/&lt;your-key&gt;",
"topics": [
"_/_/things/twin/events?filter=gt(features/temperature/properties/value,25)"
],
...
}
</code></pre></div></div>
<p>Get creative on which HTTP APIs to trigger based on twin events. E.g. invoke a “function-as-a-service” API or invoke the
Twitter API and let your digital twin tweet whenever it detects, that it is getting too warm in your office.</p>
<figure><img class="docimage" src="images/ditto.svg" alt="Ditto" style="max-width: 500px" /></figure>
<p><br />
The Eclipse Ditto team</p>
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