FWIW, I get the same:

gretl version 2017b-git
Current session: 2017-05-21 19:21

? A = \
  readfile("https://query1.finance.yahoo.com/v7/finance/download/A2A.MI?period \
 1=1492780919&period2=1495372919&interval=1d&events=history&crumb=5FqmQx4/jF6" \
Generated string A
? print A
    "finance": {
        "error": {
            "code": "Unauthorized",
            "description": "Invalid cookie"


On 21 May 2017 at 14:29, guido giaume <guido@giaume.it> wrote:
Bad news

my the cookie is the same of yesterday but when I tried with a simple script (copied  from the browser)

A = readfile("https://query1.finance.yahoo.com/v7/finance/download/A2A.MI?period1=1492780919&period2=1495372919&interval=1d&events=history&crumb=5FqmQx4/jF6")
print A

I got a message error


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Clive Nicholas

"My colleagues in the social sciences talk a great deal about methodology. I prefer to call it style." -- Freeman J. Dyson