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    <p>In both cases, your format is just slightly off. http:get can be used as an expression in the pre block, but the syntax is different from the way that you use it in the action block.</p> <p>There are actually a number of different ways that you could make this request. The traditional way is through a datasource</p> <p><strong>DATASOURCE</strong></p> <pre><code> global { datasource tiny_url_request &lt;- "http://tinyurl.com/api-create.php"; } rule using_datasource is active { select when pageview ".*" setting () pre { myLocation = page:env("caller"); thisTiny = datasource:tiny_url_request("?url="+myLocation); } { notify("URL", myLocation) with sticky = true; notify("datasource: ", thisTiny) with sticky = true; } } </code></pre> <p>The other way is how you were trying and it is through http:get as an expression in the pre block. Called as a function, http:get has 2 required parameters and two optional parameters: </p> <blockquote> <p>http:get(<strong>url</strong>, <strong>params</strong>, headers, response_headers );</p> </blockquote> <p>Your first attempt did not include the params.<br> tinyresponse = http:get(url2tiny)</p> <p>The second attempt places the params in the wrong argument position.<br> http:get("tinyurl.com/api-create.php";,{"url":myurl})</p> <p><strong>http:get (pre block)</strong></p> <pre><code> rule get_in_pre is active { select when pageview ".*" setting () pre { myLocation = page:env("caller"); tinyurl = http:get("http://tinyurl.com/api-create.php", {"url":myLocation}); turl = tinyurl.pick("$.content"); } { notify("http:get as expression",turl) with sticky = true; } } </code></pre> <p>The third method is using http:get as an action and auto-raising an event</p> <p><strong>http:get (action)</strong></p> <pre><code> rule using_action is active { select when pageview ".*" setting () pre { myLocation = page:env("caller"); } http:get("http://tinyurl.com/api-create.php") setting (resp) with params = {"url" : myLocation} and autoraise = "turl_event"; } rule get_event is active { select when http get label "turl_event" status_code "(\d+)" setting (code) pre { a = event:param("content"); } notify("Autoraised from action",a) with sticky = true; } </code></pre> <p>Here is an example of these rules executing against this very page <img src="https://i.stack.imgur.com/jn9bw.png" alt="enter image description here"></p>
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    1. COAwesome answer. I tried doing it the way you stated in the preblock, but it didn't work for me like it did for you. I will try it again. For now, I just used bit.ly instead. I think that I am going to make a bit.ly module for others to use.
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    2. CONotice that, since I kept the rules simple, I am using page:env("caller") instead of the event:param("location") that you have in your example. I also noticed that tiny url required the "http://" prefix fwiw
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