websave error when queryvalue contains "/"

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Jeffrey Kern 2017-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/340875-websave-error-when-queryvalue-contains

回答： Jeffrey Kern 2017-5-23

For the following url: https://query1.finance.yahoo.com/v7/finance/download/%5EGSPC?period1=1492522935&period2=1495114935&interval=1d&events=history&crumb=F49sxISRiT/ it looks like the last character is converted to %2F, and the website doesn't accept this. Can you help?

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Jan 2017-5-18

No, it does not look like the last character is converted. All we see is that the last charater is a "/". Why do you assume that a conversion happens and most of all for which command do you observe this? Why do you think, that the website reject this? In other words: Please post your code and explain, what happens. Then posting an answer is not based on guessing.

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Answer 1

Guillaume 2017-5-18

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编辑：Guillaume 2017-5-18

it looks like / is converted to %2F

And that would be entirely correct and the right thing to do. The encoding rule is very specific. / is a reserved character and must be percent encoded when used as anything else than a separator.

and the website doesn't accept this

I doubt that yahoo's website is faulty, so I'm certain that it would accept a %2F in the query string. In fact, I'm certain it would reject a URI that used / in the query string instead. Are you sure your problem is not because of something else? What is the exact error you get?

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Answer 2

Jeffrey Kern 2017-5-23

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https://ww2.mathworks.cn/matlabcentral/answers/340875-websave-error-when-queryvalue-contains#answer_268084

The command was: websave('temp.csv','https://query1.finance.yahoo.com/v7/finance/download/%5EGSPC?period1=1492953255&period2=1495545255&interval=1d&events=history&crumb=F49sxISRiT/')

The resulting error was: "Error using websave (line 103) The server returned the message: "Request denied" for URL, 'https://query1.finance.yahoo.com/v7/finance/download/%5EGSPC?period1=1492953255&period2=1495545255&interval=1d&events=history&crumb=F49sxISRiT/' (with HTTP response code 999)."

However, if I enter the url in my browser with "%2F" instead of "/", I get the message "invalid cookie". Unfortunately, "crumb" changes frequently (today, it doesn't contain a slash) so this is difficult to repeat.