Python Library source Learning 1:flask's App.run

The functionality implemented by the App.run () is listed first, and we analyze it in the Debug=true case.

1. Web server, processing HTTP requests

2. When the code is modified, restart the server

So how does App.run () implement these two functions?

Function One: the implementation of HTTP server, working principle:

1. Create socket, bind IP and port, listen

2. When the request is received, the request is processed. The processing of requests can be implemented in many ways, such as multi-process, multi-threading, asynchronous, etc.

Function two: After the code modification, restart the server, the implementation principle:

A process or thread monitoring code is required, and if the code is found to be modified, restart the server

Python Library source Learning 1:flask's App.run