Don't allow to override response header

[ri8ika]

I have a specific situation where I don't want to let developer override response header if the header key matched.

So, whenever developer overrides response header supposedly like this:

router.GET("/:id", func(ctx *gin.Context) {
   ctx.Header("Content-Type", "application/json") // should panic or just do not set it.
   ctx.Header("X-Any-Other-Header", "other header") // Okay set it.
   // ...
}

I want to allow setting of any header is okay but setting of specific header should panic. In this case the header is "Content-Type". So, application should result in panic or just do not set it.

Is there a way to achieve this? I couldn't think of a solution because middleware runs first and this GET func runs later.

[ri8ika]

Found a way to solve this:

https://github.com/gin-gonic/gin/issues/2748#issuecomment-1485713004

[ri8ika]

Re-opening this issue because code using afterMiddlewareWriter as in the linked issue returns gin default status code and not able to set my own. Thus, looking for better alternative to this.