glimr/http/middleware/handle_head
Handle HEAD Middleware
The HTTP spec requires HEAD responses to return the same headers as GET but with no body. Without this middleware, every handler would need explicit HEAD pattern matches that duplicate GET logic and strip the body — easy to forget and tedious to maintain. Converting HEAD to GET and stripping the body after the handler runs keeps this concern centralized.
Values
pub fn run(
ctx: context.Context(app),
next: fn(context.Context(app)) -> response.Response(wisp.Body),
) -> response.Response(wisp.Body)Rewriting the method before passing the request downstream means handlers only need a GET clause to serve both GET and HEAD. The use callback gives wisp a chance to strip the response body after the handler runs, so Content-Length and other headers remain accurate from the original GET response.