Reading-Notes

code fellows 401

Read: 03 - Express REST API

Reasons to use custom middleware:

1. Authentication
2. Logging data
3. security

True or false: The route handler is middleware?

False

In what ways can a middleware function end the process and send data to the browser?

You can send a 404 status to end the process.

At what point in the request lifecycle can you “inject” middleware?

When the request reaches the server.

What can cause express to error with “Request headers sent twice, cannot start a second response”

Vocab:

Middleware : Software which lies between an operating system and the applications running on it.

Request Object: The main entry point for an application to issue a request to the Library.

Response Object: The response returned after making a request.

Application Middleware:

Routing Middleware: The way in which the client requests are handled by the application endpoints.

Test Driven Development: The practice of creating tests before developing the actual code.

Behavioral Testing: Testing of the external behaviour of the program.