Merge branch 'prevent-rendering-connections' into 'main'

Fix outbound connection established during PDF rendering

See merge request reportcreator/reportcreator!1035

Author: MWedl

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Upcoming
 * Fix date field empty value not saved as null
+* Fix outbound connection established during PDF rendering
 * Markdown editor: fix pasted images not inserted correctly in some cases
 * Update executive summary section in HTB CBBH design
 

api/src/sysreptor/pentests/rendering/render_chromium.py

@@ -24,6 +24,10 @@ async def get_page():
             handle_sigint=False,
             handle_sigterm=False,
             handle_sighup=False,
+            # Force offline mode by using a non-existent proxy to prevent network connections.
+            # Chromium sometimes establishes a HTTPS connection during page.goto (but sends no requests because route overrides), even in offline mode.
+            # With a proxy, all outgoing network connections use the non-existent proxy, which results in connection failures.
+            proxy={'server': 'https://nonexistent.localhost'},
         )
         context = await browser.new_context(
             base_url=FAKE_BASE_URL,