error handler for stdin and stdout.

error handler for stdin and stdout.

Remove redundant tests now that str is unicode.

This eliminates a few redundant test cases.

* No longer attempts to close already freed socket file descriptor
* Use socket object to be compatible with Windows
* Do not use a timeout to avoid complication with non-blocking mode
* Use internal localhost server rather than depending on a third party
* Avoid trouble with buffered HTTP data by testing tunnelled CONNECT data

Issue #26716. IOError is a deprecated alias to OSError since Python 3.3.

Patch by Giampaolo Rodola'.

Patch by Giampaolo Rodola'.

Patch by Geoff Wilson.

Patch by Geoff Wilson.

directories.

Thanks to Wolfgang Langner for the bug report and initial version of
the patch.

typing.ContextManager.

Exceptions raised during converting argument of correct type are no longer
overridded with TypeError. Some error messages are now more detailed.