How to mount Express middleware

[kawasaki23Ven]

Hi, I need a Middleware example to all routes of my app.

Example: Verify CORS, Headers,etc.

I would greatly appreciate your help.

[clayrisser]

I really would like to know how to add middleware. I can't figure it out.

[bajtos]

Closing as a duplicate of #1293 (see also #2035 and #1982)

BTW, CORS middleware is automatically enabled by LB4, see https://loopback.io/doc/en/lb4/Server.html#customize-cors

In general, we are trying to move away from Express middleware and use the concept of a Sequence of actions and Dependency Injection to drive the request processing flow.

Could you please be more specific about "Headers" scenario you mentioned in the issue description? What are you trying to achieve? For example, to access a specific request header from your controller method, I would recommend to define a Provider class. It would really help if you could give us a specific example that we could use to drive the docs.

[clayrisser]

I wrote a component that lets you register express middleware in the sequence.

https://github.com/codejamninja/lb4-middleware