Requests caching not working for history data

[marco-sorich]

Hey everyone

I try to cache the requests to the yahoo API as described in the readme file.
Result is, that all Ticker.info is cached but Ticker.history not.
Is this a known limitation and has somebody found out how to also cache the history load request?

Here is a minimum example:

import yfinance as yf
import requests_cache
from pandas_datareader import data as pdr
from requests import Session
from requests_cache import CacheMixin, SQLiteCache
from requests_ratelimiter import LimiterMixin, MemoryQueueBucket
from pyrate_limiter import Duration, RequestRate, Limiter
class CachedLimiterSession(CacheMixin, LimiterMixin, Session):
    pass

#yf.enable_debug_mode()

session = CachedLimiterSession(
    limiter=Limiter(RequestRate(2, Duration.SECOND*5),  # max 2 requests per 5 seconds
    bucket_class=MemoryQueueBucket),
    backend=SQLiteCache("yfinance.cache"),
)
ticker = yf.Ticker('EBAY', session=session)
df = ticker.history(period='max')

print(ticker.info['longName'])

print(df.head())

With WIFI activated, it creates this output:

eBay Inc.
                               Open      High       Low     Close     Volume  Dividends  Stock Splits
Date                                                                                                 
1998-09-24 00:00:00-04:00  0.874421  0.886680  0.723236  0.774313  518656090        0.0           0.0
1998-09-25 00:00:00-04:00  0.743667  0.753882  0.672161  0.733451  121255834        0.0           0.0
1998-09-28 00:00:00-04:00  0.776356  0.831517  0.751839  0.788614   89772883        0.0           0.0
1998-09-29 00:00:00-04:00  0.807001  0.821303  0.780442  0.798829   39289536        0.0           0.0
1998-09-30 00:00:00-04:00  0.771247  0.784528  0.706892  0.736516   44113766        0.0           0.0

And deactivated WIFI this output:

EBAY: No price data found, symbol may be delisted (1d 1899-12-31 -> 2023-06-25)
eBay Inc.
Empty DataFrame
Columns: [Open, High, Low, Close, Adj Close, Volume]
Index: []

[ValueRaider]

yfinance only caches if a request is guaranteed to return same data regardless of time, e.g. yesterday. max is not 100% in past, and yfinance not smart enough to detect if market closed (maybe it could be ...)