Middleware before writing a response and after handler

[faisalraja]

How would I create a middleware that calls a function after a handler executes but before the response is written?

An example usage is if I create a custom context that has Session map that get's modified in a handler. Calling a sess.Save(c.Request(), c.Response()) after next(c) doesn't work. My guess is since the response has already been written by c.JSON(...).

[vishr]

@faisalraja Have you looked into Response#Before()?

[faisalraja]

@vishr can you point me to it's docs? I can't seem to find it. Thanks

[vishr]

The issue is still open labstack/echox#35. It is simple to use https://sourcegraph.com/github.com/labstack/echo/-/blob/response.go#L40, just pass the function you want to execute.

[faisalraja]

It worked. Thank you.

[DiveInto]

I am trying to setup a middleware to cache responses

It's convenient to check if the request hit the cache, since we can access the request info in echo.context in middleware.

while for new coming requests without cache, after the handler process the request, what is the right way to cache the response in middleware? asking because in middleware, seems we can only access echo.Response without its content

[juliankoehn]

hooking me into this.

While using Response().Before it's somehow possible to access the Content which has to be send from c.JSON to generate etags?

[youtwo123]

@vishr , hi, i already have many routes that use echo.Context.Json () to return data. Without changing the original code and not changing the Json method, is there any way to return the data under unified processing before the data is returned, such as Chinese-English conversion? This Response().Before doesn't seem to meet my needs?

[c0ze]

Yes, it would be useful for the hook function to accept and return some parameter.