text: import unittest
  
  from conans.client.graph.proxy import ConanProxy
  from conans.client.recorder.action_recorder import ActionRecorder
  from conans.client.remote_registry import RemoteRegistry
  from conans.errors import ConanException, NotFoundException
  from conans.model.ref import ConanFileReference
  from conans.test.utils.tools import TestClient, TestServer
  
  myconan1 = """
  from conans import ConanFile
  import platform
  
  class HelloConan(ConanFile):
      name = "Hello"
      version = "1.2.1"
  """
  
  
  class DownloadTest(unittest.TestCase):
  
      def test_returns_on_failures(self):
          test_server = TestServer([("*/*@*/*", "*")], [("*/*@*/*", "*")])
          servers = {"default": test_server}
  
          class Response(object):
              ok = None
              status_code = None
              charset = None
              text = ""
              headers = {}
  
              def __init__(self, ok, status_code):
                  self.ok = ok
                  self.status_code = status_code
  
          class BuggyRequester(object):
  
              def __init__(self, *args, **kwargs):
                  pass
  
              def get(self, *args, **kwargs):
                  return Response(False, 404)
  
          client2 = TestClient(servers=servers, requester_class=BuggyRequester)
          conan_ref = ConanFileReference.loads("Hello/1.2.1@frodo/stable")
          registry = RemoteRegistry(client2.client_cache.registry, client2.out)
          installer = ConanProxy(client2.paths, client2.user_io.out, client2.remote_manager,
                                 registry=registry)
  
          with self.assertRaises(NotFoundException):
              installer.get_recipe(conan_ref, False, False, None, ActionRecorder())
  
          class BuggyRequester2(BuggyRequester):
              def get(self, *args, **kwargs):
                  return Response(False, 500)
  
          client2 = TestClient(servers=servers, requester_class=BuggyRequester2)
          registry = RemoteRegistry(client2.client_cache.registry, client2.out)
          installer = ConanProxy(client2.paths, client2.user_io.out, client2.remote_manager,
                                 registry=registry)
  
          try:
              installer.get_recipe(conan_ref, False, False, None, ActionRecorder())
          except NotFoundException:
              self.assertFalse(True)  # Shouldn't capture here
          except ConanException:
              pass
  