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Dates in Headers in REST

Question asked by md0049252 on Aug 28, 2018
Latest reply on Aug 31, 2018 by md0049252

The request headers have three dates in them:






The only one that uses the correct YEAR is Date.  WHY? Why does Last-Modified have today's month and day, but a 1998 date. Why does Expires have last year's (2017) date? Here's an example, with some info scrubbed, and the dates bolded:


{'X-Blackboard-product': 'Blackboard Learn ™ 3400.0.3-rel.29+ca7bfde', 

'Last-Modified': 'Fri, 28 Aug 1998 15:36:33 GMT',

'Expires': 'Mon, 28 Aug 2017 15:36:33 GMT',

'X-Blackboard-Context-Version': '3400.0.3-rel.29+ca7bfde',

'Content-Type': 'application/json;


'Transfer-Encoding': 'chunked',

'Date': 'Tue, 28 Aug 2018 15:36:33 GMT}


So, first off, all three times are the same - which doesn't really help me know when the token expires. More confusing, however, is the fact that they all use different years. 


The question stands: Why? What do these dates reference?