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//go:build go1.7
// +build go1.7
package csrf
import (
func contextGet(r *http.Request, key string) (interface{}, error) {
val := r.Context().Value(key)
if val == nil {
return nil, fmt.Errorf("no value exists in the context for key %q", key)
return val, nil
func contextSave(r *http.Request, key string, val interface{}) *http.Request {
ctx := r.Context()
ctx = context.WithValue(ctx, key, val)
return r.WithContext(ctx)
func contextClear(r *http.Request) {
// no-op for go1.7+