HTTP-request: does not work (anymore) when TOPdesk uses HTTPS (SSL)

Disclaimer : Over the years, the use of HTTP-actions is gradually being discouraged and replaced by API's. These API's can be used in action sequences. If you have a recent version of TOPdesk, you will not be able to use most of your HTTP requests. If you are affected by this change, read our landing page regarding this change: KI 14437 - Changes to HTTP Save Actions - FAQ. Solution: When TOPdesk uses HTTPS (SSL), for http requests the certificate need to be imported into the TOPdesk truststore, because TOPdesk doesn't use it's webserver's keystore for this. When changing / renewing TOPdesk's SSL certificate, the new certificate need to be imported into TOPdesk's truststore. This can be done in the following way: 1) Export the certificate from the browser while the TOPdesk environment is opened within the browser. ※ ※ * If asked, choose for the option DER-encoding. 2) Import the certificate file into TOPdesk. Certificate files can be imported into the TOPdesk truststore From version 11.10.12 and above you can now view and upload certificates via Functional Settings > Certificates For versions below 11.10.12 you can still upload certificates for Action management via Module Settings > Action Management After importing the certificate into TOPdesk, check the following on the HTTP-requests: - port 443 is used - HTTP/1.1 protocol is selected