DecodeResponse attempts to decode the contents of the response as a JSON object.

DoHttpRequest performs a single HTTP request.

DoHttpRequestWithRedirects runs a HTTP request and responds to redirects.

GetDefaultError returns the default text for standard error codes (blank if none).

LogHttpStats is intended to be called after all HTTP operations for the commmand have finished.

NewHttpClient returns a new HttpClient for the given host (which may be "host:port").

NewHttpRequest creates a template request, with the given headers & UserAgent supplied.

Logic is copied, with small changes, from "net/http".ProxyFromEnvironment in the go std lib.