When working with third-party APIs and using HTTP Request to send API calls, occasionally an error may occur that states “Unimplemented control instruction”. This may be due to the third-party API not handling the request correctly and not responding within a certain window. To avoid this, try calling the HTTP Request command without the keep-alive (*) parameter. If it happens often, catch the error (#17) and simply re-issue the same request. Below is an example:

$http_status:=HTTP Request(HTTP POST method;$url;$body;$response;$headerNames;$headerValues) If (Error=17)    $http_status:=HTTP Request(HTTP POST method;$url;$body;$response;$headerNames;$headerValues) End if

Note that using the Error variable means that you are using ON ERROR CALL to catch the error.