[meta] track feature parity between py2/3

[temoto]

Let's fill this table with everything known to be different between py2/3.

Solve by take py3 version

• [proxy] py2: socks imported from vendored socksipy; py3: socks is first searched in installed packages, then vendored
• HTTPConnectionWithTimeout py2: bug socket.error rewrap into new instance, loosing traceback, errno
• HTTPSConnectionWithTimeout (TLS)
  • py2: bug socket.error rewrap into new instance, loosing traceback, errno
• Response only py3 merges same name headers with comma
• Http (public API)
  • __init__ deprecate ssl_version kwarg from py2; add custom SSLContext
  • _conn_request py3 handles ResponseNotReady from conn.getresponse()
  • _conn_request py3 handles socket.timeout from conn.getresponse() but doesn't retry
  • request py3 handles =?...?= encoding in cached response headers

Solve

• [proxy] support callable proxy_info(scheme)
• Http (public API)
  • request py3 passes https parameters based on subclass(HTTPSConnectionWithTimeout), opposed to simple scheme == 'https' check in py2, (temoto) IMHO should check both
• AppEngine support is straight up absent on py3, take from py2 Add Google App Engine support to py3 fork #107

Figure out

• _updateCache py3 handles UnicodeEncodeError with a weird dance
• HttpsConnectionWithTimeout (TLS)
  • py2: custom cert CN to hostname verificator, copypasted from Google Appengine SDK
  • py3: likely bug socket.connect ignores address from getaddrinfo, connects to self.host,port
  • py3.3: sock.shutdown() on ssl.match_hostname error - it's either shutdown is redundant or fd leak until remote closes socket
  • py2: (connect) special handling of ssl.SSL_ERROR_SSL -> raise SSLHandshakeError
• exceptions py2 unique:
  • SSLHandshakeError
  • CertificateValidationUnsupported, CertificateHostnameMismatch
  • NotSupportedOnThisPlatform
  • NotRunningAppEngineEnvironment
• class Http (public API)
  • _conn_request py2 checks hasattr(conn, sock)
  • _conn_request py2 handles ssl_SSLError
  • _conn_request different way to read errno from socket.error
  • _conn_request py2 handles ECONNREFUSED
  • _conn_request py3 double conn.close() on socket.error from conn.getresponse()
  • request py2 proxy_info = self._get_proxy_info(scheme, authority)

TODO write tests

• safename bytes input
• _entry_disposition request cache-control max-age not a number
• _entry_disposition request cache-control min-fresh not a number
• _entry_disposition response cache-control max-age not a number
• _updateCache info.as_string fail with UnicodeEncodeError
• DigestAuthentication challenge qop invalid value
• DigestAuthentication challenge algorithm invalid value
• HmacDigestAuthentication
• WsseAuthentication
• GoogleLoginAuthentication
• repr(ProxyInfo)
• proxy_info_from_environment method not http,https
• proxy_info_from_url blabla@host without :password part
• HTTPSConnectionWithTimeout using proxy
• HTTPSConnectionWithTimeout except (ssl.SSLError,...): if self.sock: self.sock.close()
• HTTPSConnectionWithTimeout socket.timeout, gaierror
• Http.clear_credentials
• Http._conn_request socket.timeout
• Http._conn_request conn.request -> http.client.HTTPException
• Http._conn_request conn.getresponse -> except (socket.error, http.client.HTTPException)
• Http._request on redirect strip headers if-none-match, if-modified-since, authorization
• Http.request uri http://domain:443
• Http.request uri bytes Some HTTP requests fail if "uri"type is "bytes" #225
• Http.request header encoding =?...?=
• Http.request from cache with -x-permanent-redirect-url while redirect limit overflow
• Http.request on 304 preserve .stale_digest from cache
• Http.request from cache stale/transparent new response not 200,304 -> cache.delete
• Response .dict = self