code: def fetch_url(self, url):
      info = "checking {url} with {params}"
      logger.info(info.format(url=url, params=self.requests_kwargs))
      # setting decode_unicode=True sometimes results in a
      # UnicodeEncodeError exception, so instead we'll use
      # pandas logic for decoding content
      try:
          response = requests.get(url, **self.requests_kwargs)
      except requests.exceptions.ConnectionError:
          raise Exception("Could not connect to %s" % url)
  
      if not response.ok:
          raise Exception("Problem reaching %s" % url)
      elif response.is_redirect:
          # On the offchance we don't catch a redirect URL
          # in validation, this will catch it.
          new_url = response.headers["location"]
          raise FetcherCSVRedirectError(
              url=url,
              new_url=new_url,
              extra={"old_url": url, "new_url": new_url},
          )
  
      content_length = 0
      logger.info(
          "{} connection established in {:.1f} seconds".format(
              url, response.elapsed.total_seconds()
          )
      )
  
      # use the decode_unicode flag to ensure that the output of this is
      # a string, and not bytes.
      for chunk in response.iter_content(
          self.CONTENT_CHUNK_SIZE, decode_unicode=True
      ):
          if content_length > self.MAX_DOCUMENT_SIZE:
              raise Exception("Document size too big.")
          if chunk:
              content_length += len(chunk)
              yield chunk
  
      return
  
imports: from abc import ABCMeta, abstractmethod
  from collections import namedtuple
  import hashlib
  from textwrap import dedent
  import warnings
  from logbook import Logger
  import numpy
  import pandas
  from pandas import read_csv
  import pytz
  import requests
  from six import StringIO, iteritems, with_metaclass
  from catalyst.errors import MultipleSymbolsFound, SymbolNotFound, ZiplineError
  from catalyst.protocol import DATASOURCE_TYPE, Event
  from catalyst.assets import Equity
  from catalyst.constants import LOG_LEVEL
label_desc: Use image node_id 3 for calling the PandasRequestsCSV obj's underlying member method code with example usage: obj.fetch_url(url) without return types