I tried to use both http and https as suggested by read.csv("http://ichart.finance.yahoo.com/table.csv?s=SPY") Not Working. But none of both are working.
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1I found out the answer from https://stackoverflow.com/questions/44057580/yahoo-finance-api-changes-2017?rq=1 – William Cao Jun 07 '17 at 07:12
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The service is discontinued, read https://forums.yahoo.net/t5/Yahoo-Finance-help/Is-Yahoo-Finance-API-broken/td-p/250503
The Yahoo finance is now downloading historical data from https://query1.finance.yahoo.com/v7/finance/download/ using authorization token.

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