Golang : Set or add headers for many or different handlers
Problem :
In Golang, setting headers can be done easily with the Set() method.
At the moment, you are setting headers for each individual handler in such as manner :
func handlerA(w http.ResponseWriter, req *http.Request) {
w.Header().Set("X-Frame-Options", "SAMEORIGIN")
w.Header().Set("Content-Type", "text/plain")
w.Write([]byte("Set header for handler A."))
}
func handlerB(w http.ResponseWriter, req *http.Request) {
w.Header().Set("X-Frame-Options", "SAMEORIGIN")
w.Header().Set("Content-Type", "text/plain")
w.Write([]byte("Set header for handler B."))
}
Instead of setting header for each individual handler manually, you want to use a function to set the headers.
NOTE : This method can apply to Add headers as well
Solution :
Create a common SetHeaders()
function that will write to http.ResponseWriter. For example :
func SetHeaders(w http.ResponseWriter) {
w.Header().Set("X-Frame-Options", "SAMEORIGIN")
w.Header().Set("Content-Type", "text/plain")
}
func handlerA(w http.ResponseWriter, req *http.Request) {
SetHeaders(w)
w.Write([]byte("Set header for handler A."))
}
func handlerB(w http.ResponseWriter, req *http.Request) {
SetHeaders(w)
w.Write([]byte("Set header for handler B."))
}
See also : Golang : How to Set or Add Header http.ResponseWriter?
By Adam Ng
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