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* Fix If-Modified-Since example in API.md Fixes the example curl request date format. It didn't conform to the IMF-fix standard and was not accepted by the parseDate function. Signed-off-by: Koen Tange <monokles@protonmail.ch> * Add If-Modified-Since format description to API.md Adds a short description elaborating on the different date formats supported by the If-Modified-Since header. Signed-off-by: Koen Tange <monokles@protonmail.ch> * Mark old time formats as obsolete in API.md Clarified in the text that only the IMF-fixformat date format should be used in conjuction with the If-Modified-Since header. Signed-off-by: Koen Tange <monokles@protonmail.ch>