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What these changes does?
Increases the default concurrent connections accepted by aiohttp.web.run_app() function.
Asyncio, by default, configures this value to 128, but allow to increase it. The run_app() function doesn't allow it. This patch only add the parameter backlog to function definition and pass to the create_server asyncio function.
How to test your changes?
Using ab (Apache Benchmark) to test if concurrent connections was really increased.
Related issue number
I don't know if there's a issue assigned.
Checklist
Added backlog option to support more than 128 (default value in "create_server" function) concurrent connections.