I have been using http://chart.finance.yahoo.com for several years to get basic stock charts. As of yesterday, 5/16/17, stock charts are not downloadable and instead a message is returned saying, "Thank you for your patience. Our engineers are working quickly to resolve the issue." I am hoping this is a temporary problem. Stock-price data is still available for download from Yahoo, so it is only the charting that has become unavailable.
Any information on this would be appreciated.
There is some discussion here:
Also go over and up vote:
A possible work-around.
I having been using Yahoo to look at ^GSPC charts for several years. Around summer of fall of 2017, the interactive ^GSPC charts would come up blank. A work-around that I found was to go to the Watchlist or "Recently Viewed" list, and click on some symbols other than what I wanted. Usually I am able to quickly bring up a chart that does display. Now go back and click on ^GSPC, and voila, it comes up.