Use g_access in web cache, only SoupSession, pass filenames
Use g_access in web cache, only SoupSession, pass filenames

Using g_access instead of g_file_test is a lot faster and avoids
big delays when accessing the disk.

Using only the SoupSession without resource-request-starting simplifies
the code. So offline mode is not an option for the moment.

Pass filenames directly to speed up lookups.


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