FYI, for those seeking a workaround:
One of our salesforce security guys found a workaround that involves modifying a few python scripts under the lib folder.
There are two methods, long polling and web sockets. Long polling was applicable to us so we just fixed that.
Some information on the usage of proxy settings in aiohttp can be found here:
Advanced Client Usage — aiohttp 3.9.3 documentation
The fixes can be applied to the TA-sfdc-streaming-api pack and below is what we modified to successfully subscribe via a proxy.
1. Modify /opt/splunk/etc/apps/TA-sfdc-streaming-api/lib/aiocometd/transports/long_polling.py
search for one instance of "session.post" and add ,proxy="http://<proxyip>:<port>"
2. Modify /opt/splunk/etc/apps/TA-sfdc-streaming-api/lib/aiosfstream/auth.py
search for two instances of "session.post" and add ,proxy="http://<proxyip>:<port>"
Hope this helps!
