old_contents: import sys
  import urllib
  import urllib2
  import urlparse
  import hmac
  import hashlib
  import json
  from datetime import datetime
  
  
  class AlluraApiClient(object):
  
      def __init__(self, base_url, api_key, secret_key, verbose=False):
          self.base_url = base_url
          self.api_key = api_key
          self.secret_key = secret_key
          self.verbose = verbose
  
      def sign(self, path, params):
          params.append(('api_key', self.api_key))
          params.append(('api_timestamp', datetime.utcnow().isoformat()))
          message = path + '?' + urllib.urlencode(sorted(params))
          digest = hmac.new(self.secret_key, message, hashlib.sha256).hexdigest()
          params.append(('api_signature', digest))
          return params
  
      def call(self, url, **params):
          url = urlparse.urljoin(self.base_url, url)
          params = self.sign(urlparse.urlparse(url).path, params.items())
  
          try:
              result = urllib2.urlopen(url, urllib.urlencode(params))
              resp = result.read()
              return json.loads(resp)
          except urllib2.HTTPError, e:
              if self.verbose:
                  error_content = e.read()
                  e.msg += '. Error response:\n' + error_content
              raise e
  
new_contents: import sys
  import urllib
  import urllib2
  import urlparse
  import hmac
  import hashlib
  import json
  from datetime import datetime
  
  
  class AlluraApiClient(object):
  
      def __init__(self, base_url, api_key, secret_key, verbose=False, retry=True):
          self.base_url = base_url
          self.api_key = api_key
          self.secret_key = secret_key
          self.verbose = verbose
          self.retry = retry
  
      def sign(self, path, params):
          params.append(('api_key', self.api_key))
          params.append(('api_timestamp', datetime.utcnow().isoformat()))
          message = path + '?' + urllib.urlencode(sorted(params))
          digest = hmac.new(self.secret_key, message, hashlib.sha256).hexdigest()
          params.append(('api_signature', digest))
          return params
  
      def call(self, url, **params):
          url = urlparse.urljoin(self.base_url, url)
          params = self.sign(urlparse.urlparse(url).path, params.items())
  
          while True:
              try:
                  result = urllib2.urlopen(url, urllib.urlencode(params))
                  resp = result.read()
                  return json.loads(resp)
              except urllib2.HTTPError, e:
                  if self.verbose:
                      error_content = e.read()
                      e.msg += '. Error response:\n' + error_content
                  raise e
              except (urllib2.URLError, IOError):
                  if self.retry:
                      continue
                  raise
  
subject: Add auto-retry on network errors.