Obtain http.Request in http handler

[matejkramny]

Hi there, is there a way to get the original http.Request object within the handler code?

I've scoured the docs and examples and can't find any way to get the request or any information about it. Am I missing something fundamental?

I'm trying to think ahead and might need to get the request headers, ip address or other things inside a handler.

Is there a good way to do this?

Thank you!
Matej

[k1ng440]

You can define a net/http middleware to inject http.Request and http.ResponseWriter to context.Context

package httputil

import (
	"context"
	"net/http"
)

type (
	requestCtxKey  struct{}
	responseCtxKey struct{}
)

func InjectRequestToContext(next http.Handler) http.Handler {
	f := func(w http.ResponseWriter, r *http.Request) {
		r = r.WithContext(context.WithValue(r.Context(), requestCtxKey{}, r))
		r = r.WithContext(context.WithValue(r.Context(), responseCtxKey{}, w))
		next.ServeHTTP(w, r)
	}

	return http.HandlerFunc(f)
}

func RequestFromContext(ctx context.Context) *http.Request {
	val := ctx.Value(requestCtxKey{})
	return val.(*http.Request)
}

func ResponseFromContext(ctx context.Context) http.ResponseWriter {
	val := ctx.Value(responseCtxKey{})
	return val.(http.ResponseWriter)
}