What are these unknown client errors on GAE instance?

I deployed Django Application on GAE. After that, I'm getting a client error on unknown files. Those files are below.

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I know only favicon.ico because I haven't uploaded it yet. But I don't know others. Almost of them look about WordPress.
Are these client errors attacks for WordPress files on GAE?
How can I stop these?
Thank you.

Posting as community wiki:

Those are bots/automated scripts some of which are probably looking for weaknesses to exploit. We get those too (and have always gotten them in our GAE deployed sites).

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