Historic data server issue

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jezspk1
Historic data server issue

Can anyone see why the following would cause a error when pasted in the REST companion app:
https://demo-api.ig.com/gateway/deal/prices/TM.D.MEX.IFD.IP/MINUTE/2017-...

changing the 'From' date to the 18th or the 'To' date to the 23rd and the problem goes away. Here is another:
https://demo-api.ig.com/gateway/deal/prices/KB.D.TK.CASH.IP/MINUTE/2017-...

Notably both requests are for Friday 17th to Friday 24th, but
they are for different months and different instruments.