* expend checksum format to <algorithm>:(<checksum>|<url>)
* continue to code at office
* ALPHA - expend checksum format to <algorithm>:(<checksum>|<url>)
* clean up tmpfile and comment
* try to add test code for 27617
* try to add test code for 27617
* try to add test code for 27617
* try to fix [Could not find or access 'testserver.py']
* fix test code [Could not find or access 'testserver.py']
* fix test code [add files dir]
* fix test code [files dir not exists]
* as [connection was closed before a valid response was received]
* [connection was closed before a valid response was received]
* [connection was closed before a valid response was received]
* add test item [sha1 and sha256]
* since [connection was closed before a valid response was received]
* fix [connection was closed before a valid response was received]
* fix test code typo
* add docs for #27617
* PR #43751 is minor change
* fix pep8 issue.
* fix test code style.
* fix unexpected quote
