TRUSTAbyss wrote
I would like to know this as well since there is no way in PHP to prevent the Proxy header.
Please raise such issues to our attention using email. It's way more effective than this forum which isn't frequently monitored by our development team.
Regarding the issue, it is easy to circumvent: Add a new custom environment variable in Scripting Parameters named HTTP_PROXY and with no value. This will clear any HTTP_PROXY that may have been passed through the HTTP Proxy header.
Do you confirm this works for you?