a small forward proxy to serve the http requests from local files - local data created on first request with the content retrieved from the remote url

Note: once the local file is created it won't be updated as the main purpose of this proxy was to get consistent results when running the automated (xslt&xquery) tests that are accessing remote files (schemas, dtds, images, etc.)

• store the uri->local file name mappings in a dictionary
  • load to memory from a json file on program start; if the file doesn't exists an empty dictionary is created
• on a http request the url is remapped to a local file name
  • the local file name is retieved from the dictionary
  • if there is no existing mapping a new entry is created from the tuple (uri, len(dictionary))
  • the updated dictionary is serialized as json and saved to disk
• if the local file doesn't exists then a new one is created with the content retrieved from the remote location or with empty if there was a http or url exception
• finally the GET request is served from the local file content with succes code 200 or with error 404 if the file is empty