How to know if the file exists or not in the storage?

[CoutinhoElias]

I'm building my url but what I get is a Json object testing in the browser.

{
"error": {
"code": 404,
"message": "Not Found."
}
}

In the traceback I have the following return:

--- Logging error ---
Traceback (most recent call last):
File "/home/elias/Documentos/PROGRAMACAO/kivy_venv/lib/python3.9/site-packages/kivy/loader.py", line 345, in _load_urllib
fd = opener.open(request)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/urllib/request.py", line 523, in open
response = meth(req, response)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/urllib/request.py", line 632, in http_response
response = self.parent.error(
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/urllib/request.py", line 561, in error
return self._call_chain(*args)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/urllib/request.py", line 494, in _call_chain
result = func(*args)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/urllib/request.py", line 641, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/logging/init.py", line 1083, in emit
msg = self.format(record)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/logging/init.py", line 927, in format
return fmt.format(record)
File "/home/elias/Documentos/PROGRAMACAO/kivy_venv/lib/python3.9/site-packages/kivy/logger.py", line 291, in format
record = copy.deepcopy(record)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 270, in _reconstruct
state = deepcopy(state, memo)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 230, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 210, in _deepcopy_tuple
y = [deepcopy(a, memo) for a in x]
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 210, in
y = [deepcopy(a, memo) for a in x]
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 264, in _reconstruct
y = func(*args)
TypeError: init() missing 5 required positional arguments: 'url', 'code', 'msg', 'hdrs', and 'fp'
Call stack:
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/threading.py", line 930, in _bootstrap
self._bootstrap_inner()
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/threading.py", line 973, in _bootstrap_inner
self.run()
File "/home/elias/Documentos/PROGRAMACAO/kivy_venv/lib/python3.9/site-packages/kivy/loader.py", line 533, in run
func(*args, **kargs)
File "/home/elias/Documentos/PROGRAMACAO/kivy_venv/lib/python3.9/site-packages/kivy/loader.py", line 290, in _load
data = self._load_urllib(filename, kwargs['kwargs'])
File "/home/elias/Documentos/PROGRAMACAO/kivy_venv/lib/python3.9/site-packages/kivy/loader.py", line 382, in _load_urllib
Logger.exception('Loader: Failed to load image <%s>' % filename)
Message: 'Loader: Failed to load image https://firebasestorage.googleapis.com/v0/b/inventarioshop-8318f.appspot.com/o/im_bd%2F01001BA476.png?alt=media&token=5ZcdRS5cXIFtvv2BbULpQMKl6sV8QZbnSDUdQzJl'
Arguments: ()
--- Logging error ---
Traceback (most recent call last):
File "/home/elias/Documentos/PROGRAMACAO/kivy_venv/lib/python3.9/site-packages/kivy/loader.py", line 345, in _load_urllib
fd = opener.open(request)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/urllib/request.py", line 523, in open
response = meth(req, response)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/urllib/request.py", line 632, in http_response
response = self.parent.error(
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/urllib/request.py", line 561, in error
return self._call_chain(*args)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/urllib/request.py", line 494, in _call_chain
result = func(*args)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/urllib/request.py", line 641, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/logging/init.py", line 1083, in emit
msg = self.format(record)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/logging/init.py", line 927, in format
return fmt.format(record)
File "/home/elias/Documentos/PROGRAMACAO/kivy_venv/lib/python3.9/site-packages/kivy/logger.py", line 291, in format
record = copy.deepcopy(record)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 270, in _reconstruct
state = deepcopy(state, memo)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 230, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 210, in _deepcopy_tuple
y = [deepcopy(a, memo) for a in x]
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 210, in
y = [deepcopy(a, memo) for a in x]
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/copy.py", line 264, in _reconstruct
y = func(*args)
TypeError: init() missing 5 required positional arguments: 'url', 'code', 'msg', 'hdrs', and 'fp'
Call stack:
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/threading.py", line 930, in _bootstrap
self._bootstrap_inner()
File "/home/elias/.pyenv/versions/3.9.6/lib/python3.9/threading.py", line 973, in _bootstrap_inner
self.run()
File "/home/elias/Documentos/PROGRAMACAO/kivy_venv/lib/python3.9/site-packages/kivy/loader.py", line 533, in run
func(*args, **kargs)
File "/home/elias/Documentos/PROGRAMACAO/kivy_venv/lib/python3.9/site-packages/kivy/loader.py", line 290, in _load
data = self._load_urllib(filename, kwargs['kwargs'])
File "/home/elias/Documentos/PROGRAMACAO/kivy_venv/lib/python3.9/site-packages/kivy/loader.py", line 382, in _load_urllib
Logger.exception('Loader: Failed to load image <%s>' % filename)
Message: 'Loader: Failed to load image https://firebasestorage.googleapis.com/v0/b/inventarioshop-8318f.appspot.com/o/im_bd%2F0100251633.png?alt=media&token=5ZcdRS5cXIFtvv2BbULpQMKl6sV8QZbnSDUdQzJl'
Arguments: ()