SSJS: read response headers from Script.Util.HttpRequest object in SFMC

Question

We need to retrieve the response headers from an HTTP GET call issued in SSJS with the Script.Util.HttpRequest function.

Unfortunately, even though it seems straightforward and the task itself is pretty trivial, we cannot get our head around it.

We already read the answer by (the great) Gortonington to this very recent thread, but event though it shed some light, it does not solve our problem.

We understand that header are returned as CLR objects, but evidently we are doing something wrong.

Below is the (one of the many) snippet of code that clarifies what we are trying to achieve:

<script runat="server" type="text/javascript">
  Platform.Load("core","1");
  var endpoint = "www.google.com";
  var req = new Script.Util.HttpRequest(endpoint);
  req.emptyContentHandling = 0;
  req.retries = 2;
  req.continueOnError = true;
  req.method = "GET";
  req.setHeader("Cache-Control","no-cache");
  var resp = req.send();
  try {
    Platform.Response.Write("Return header Stringify: " + Stringify(resp.headers) + "<br />");
    Platform.Response.Write("Return header: " + resp.headers["server"] + "<br />");
    var resultJSON = Platform.Function.ParseJSON(String(resp.headers["server"]));
    Platform.Response.Write("Return header ParseJSON: " + Stringify(resultJSON));
  } catch(e) {
    Write(Stringify(e));
  }
</script>

Inside the try block there are some attempts to print the "server" header (we also tried "Server", "location" and others). The first Stringify returns an empty object. The other two attempts return: "Use of Common Language Runtime (CLR) is not allowed".

Can anyone help us on this matter? Thanks in advance.

Answer 1

SOLUTION

Taken from the comments, the issue was a business rule needed to be enabled:

In the end, the support had to (quoting them) "enable a business rule internally that resolves the CLR error." Now it is all working as expected.

---

So, I copy/pasted your code over into my environment to test it and figured it out. You had the endpoint without the protocol set. So you had www.google.com instead of https://www.google.com.

With this change it all worked completely fine.

<script runat="server" type="text/javascript">
  Platform.Load("core","1");
  var endpoint = "https://www.google.com";
  var req = new Script.Util.HttpRequest(endpoint);
  req.emptyContentHandling = 0;
  req.retries = 2;
  req.continueOnError = true;
  req.method = "GET";
  req.setHeader("Cache-Control","no-cache");
  var resp = req.send();
  try {
    Platform.Response.Write("Return header Stringify: " + Stringify(resp.headers) + "<br />");
    Platform.Response.Write("Return header: " + resp.headers["Server"] + "<br />");
    var resultJSON = Platform.Function.ParseJSON(String(resp.headers["server"]));
    Platform.Response.Write("Return header ParseJSON: " + Stringify(resultJSON));
  } catch(e) {
    Write(Stringify(e));
  }
</script>

This was the response I got from the above code:

Return header Stringify: {"X-XSS-Protection":"0","X-Frame-Options":"SAMEORIGIN","Cache-Control":"private, max-age=0","Content-Type":"text/html; charset=ISO-8859-1","Date":"Tue, 03 Nov 2020 22:11:50 GMT","Expires":"-1","P3P":"CP=\"This is not a P3P policy! See g.co/p3phelp for more info.\"",...[truncated for brevity]...,"Transfer-Encoding":"chunked"}
Return header: gws
Return header ParseJSON: "undefined"