You can download this HotFix from TIBCO Support Portal (https://support.tibco.com). You will need to provide your TIBCO Support Portal credentials. Once logged in you can the download the hotfix by selecting the “Downloads” -> “Hotfixes” option. Then go to the AvailableDownloads/BusinessWorks/5.15.0/hotfix-04.

=================================================================================
Closed Issues in 5.15.0_HF-004 (This Release)

BW-19208
Send HTTP Request activity fails with the exception java.net.URISyntaxException: Illegal character in query at index xxx when there are special characters in the query string

BW-19176
BW Tomcat HTTP server doesn't add all the trusted certificates from the trusted certificates folder to the trust store that it creates.

BW-19070
HTTP Server with client authentication fails when deployed as remote repository has been fixed.

BW-18204
Different behaviour for QueryString Parameter in Send HTTP Request activity between BW 5.13 and 5.15 observed.This is now having the similar behaviour.
=================================================================================