What is the point of a 2 way Layer?

[tausifcreates]

Summary

As you can see from the image. The request passes through 3 layers, and then again, response passes through the same layers. What is the point of this 2 way behavior?

axum version

0.7.4

[davidpdrsn]

So you can modify both the request and response from the same middleware.

[jplatte]

... or use information from the request to modify the response

[tausifcreates]

Thank you guys!