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Fixes CVE-2020-7212 (1.25.2 - 1.25.7) The _encode_invalid_chars function does not remove duplicate percent encodings in the _percent_encodings array, which combined with the normalization step could take O(N^2) time to compute for a URL of length N. This results in a marginally higher CPU consumption compared to the potential linear time achieved by deduplicating the _percent_encodings array. CC: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>