Fixes Python SDK tests when external package loading is enabled. #3347
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Some explanation of the failure here: The
internet
outbound in workerd is the one thatfetch
targets, so since we fetch packages in workerd and this test pointsfetch
at a custom Python server, it goes into an infinite loop due to the Python server attempting to load packages from ... itself.Solution here is to create a JS proxy that either sends the requests onto the Python server or to the internet.