How can i access ECB Dataflow? TooManyRedirects: Exceeded 30 redirects

I am using Request package form pandasdmx library to to access some exchange rates from the European Central Bank. I tried to follow the stepts highlighted in the following walkthrough: https://pandasdmx.readthedocs.io/en/v1.0/walkthrough.html# bur it is giving me an error when i try to access the different dataflows. This is the code that i am using:

import pandasdmx as sdmx
ecb = sdmx.Request('ECB')
ecb_via_proxy = sdmx.Request('ECB',proxies={'http': 'http://1.2.3.4:5678'})
flow_msg = ecb.dataflow()


flow_msg = ecb.dataflow()
Traceback (most recent call last):

  File "<ipython-input-8-9011799aab2e>", line 1, in <module>
    flow_msg = ecb.dataflow()

  File "C:\Users\gcperez\AppData\Local\Continuum\anaconda3\lib\site-packages\pandasdmx\api.py", line 361, in get
    base_url, params=params, headers=headers, fromfile=fromfile)

  File "C:\Users\gcperez\AppData\Local\Continuum\anaconda3\lib\site-packages\pandasdmx\remote.py", line 98, in get
    url, params=params, headers=headers)

  File "C:\Users\gcperez\AppData\Local\Continuum\anaconda3\lib\site-packages\pandasdmx\remote.py", line 118, in request
    with closing(requests.get(url, params=params, **cur_config)) as response:

  File "C:\Users\gcperez\AppData\Local\Continuum\anaconda3\lib\site-packages\requests\api.py", line 76, in get
    return request('get', url, params=params, **kwargs)

  File "C:\Users\gcperez\AppData\Local\Continuum\anaconda3\lib\site-packages\requests\api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)

  File "C:\Users\gcperez\AppData\Local\Continuum\anaconda3\lib\site-packages\requests\sessions.py", line 530, in request
    resp = self.send(prep, **send_kwargs)

  File "C:\Users\gcperez\AppData\Local\Continuum\anaconda3\lib\site-packages\requests\sessions.py", line 665, in send
    history = [resp for resp in gen] if allow_redirects else []

  File "C:\Users\gcperez\AppData\Local\Continuum\anaconda3\lib\site-packages\requests\sessions.py", line 665, in <listcomp>
    history = [resp for resp in gen] if allow_redirects else []

  File "C:\Users\gcperez\AppData\Local\Continuum\anaconda3\lib\site-packages\requests\sessions.py", line 166, in resolve_redirects
    raise TooManyRedirects('Exceeded {} redirects.'.format(self.max_redirects), response=resp)

TooManyRedirects: Exceeded 30 redirects.

I have used this kind of access many times before and nothing went wrong. ¿Anyone knows what could be happening?

Solution

The ECB changed its web service URL, and the version of pandaSDMX that you have does not have the current URL. I would suggest to use the sdmx1 package in which this issue was fixed > 7 months ago (see the diff here):

$ pip install sdmx1

import sdmx

ECB = sdmx.Client("ECB")
flow_msg = ECB.dataflow()   

print(repr(flow_msg))

gives:

<sdmx.StructureMessage>                       
  <Header>                                                                                        
    id: 'IREF508443'                                                                              
    prepared: '2021-03-04T09:40:40+00:00'
    receiver: <Agency not_supplied>
    sender: <Agency Unknown>
    source: 
    test: False
  response: <Response [200]>
  DataflowDefinition (71): AME BKN BLS BNT BOP BSI BSP CBD CBD2 CCP CIS...
  DataStructureDefinition (55): ECB_AME1 ECB_BKN1 ECB_BLS1 ECB_BOP_BNT ...