System.InvalidOperationException: Result has no value.

[twestosaurus]

Hello,

there seems to be no data returned since yesterday and I'm getting this error

System.InvalidOperationException: Result has no value.
   at YahooQuotesApi.Result`1.get_Value() in C:\projects\yahooquotesapi\YahooQuotesApi\Utilities\Result.cs:line 23

since yesterday (from EU) - it doesn't look like another cookie & crumb issue. I tried it with version 6.0.0. and 5.5.8.. Anyone has an idea what might be the cause?

[zeabee]

I have the same issue (UK). It looks like the field PriceHistory cannot be retrieved. Looking at the error (in Visual Studio) it says:

PriceHistory {Error: ErrorResult { Message = Response status code does not indicate success: 401 (Unauthorized)., Exception = System.Net.Http.HttpRequestException: Response status code does not indicate success: 401 (Unauthorized).
at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()
at YahooQuotesApi.YahooHistory.Produce[T](Uri uri, CancellationToken ct) in C:\projects\yahooquotesapi\YahooQuotesApi\History\YahooHistory.cs:line 73 }} YahooQuotesApi.Result<YahooQuotesApi.PriceTick[]>

No idea what is causing it but VPNing into the US did not solve the problem.

[drakovic23]

I have the same issue, other packages like the yfinance python package also have reports of similar issues. Hopefully Yahoo hasn't pulled the plug.

[sachatomey]

Issue persists. Some top level data (name, current price etc) is returned but price history is missing.

[drakovic23]

I tested the Python yFinance package and it works now, not sure if the previous issue was related to the issue with this package.
I think the issue is that this package uses the https://query2.finance.yahoo.com/v7/finance/download/{ticker} url whereas the Python yFinance package uses the JSON returned from https://query2.finance.yahoo.com/v8/finance/chart/{ticker} as an example.

If I try to download a csv of historical data from Yahoo Finance it now requires me to login which it didn't before.

Here's another example of calling historical data on AAPL using the yFinance method:

https://query2.finance.yahoo.com/v8/finance/chart/AAPL?period1=345448861&period2=1726203661&interval=1d&events=div,splits

The above returns JSON data which can be used to construct the price ticks.

[twestosaurus]

@drakovic23 thanks for the addtitional info - so if I see correctly it should be possible to change the url in this package, right? I just quickly tried the url from the python package with c# and no matter what headers I added to the httpclient I always got a error "429 - too many requests".

[drakovic23]

I think the only header I had to adjust was the text/json to text/csv. The real issue is that the tickparser parses CSV data whereas the other URL returns JSON so if you adjust the URL you'd have to adjust the tickparser as well.

I created a fork here: https://github.com/drakovic23/YahooQuotesApiFork that currently pulls price history correctly however it fails 2 tests, one is a rounding error to do with history in a different base currency that I am stuck on and I'm not sure about the other test that is failing at the moment. I'll try to get the tests to pass and then cleanup the code a bit as it's a mess right now. I also didn't add any other dependencies but it may be better to use a different JSON parsing mechanism possibly from the Newtonsoft package.

EDIT:
Also I'm new to this so if anyone has any better ideas or comments please let me know. Idk if the authors are maintaining this package and I had to fix the history issue quickly for a separate project, my fork should not be used in production.

[twestosaurus]

@drakovic23 thanks for your effort! - i will try your package when I have time and maybe also have a look at the tickerparser (and in the meantime hope that maybe @dshe reappears)

[rwb196884]

Ta @drakovic23 ; that's got me up and running again.

[dshe]

The new version now provides price history. Sorry for the delay!

[ymilad]

The new version now provides price history. Sorry for the delay!

it works, thank you