Philip Whitfield 606331fdcb
fix url parsing with port numbers
String.get_slice_count is always at least 1 or 2 for bases with a port number.
Before this change the following URL would return ERR_INVALID_PARAMETER ```ws://127.0.0.1:8000/test```

(cherry picked from commit 3d9f29910ce6d317f70b2d4e7cacea2d33f28bb1)
2021-06-17 12:47:54 +02:00
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