Golang net/http Backend blocking requests

Question

Is there an way to reject/block an request in go net/http "listenandserver"? In my case I want that only requests with useragent "test 1.0" are allowed. Everything else will be blocked.
"I also want to make an rate limit. ex: (If requests per second from same IP gets over 50 R/S over second block for 1h...)" I can do this but as I said I dont know how to block the request.

package main

import (
    "net/http"
)

func handle(w http.ResponseWriter, r *http.Request) {
    if r.UserAgent() == "test/1.0" {
        //Allow
    } else {
        //Block request
    }
}

func main() {
    http.HandleFunc("/", handle)
    http.ListenAndServe(":8080", nil)

}

user5728991 · Accepted Answer · 2021-04-25 20:13:52Z

2

There are a couple of options. The first is to return an error response:

func handle(w http.ResponseWriter, r *http.Request) {
    if r.UserAgent() == "test/1.0" {
        //Allow
    } else {
        http.Error(w, "forbidden", http.StatusForbidden)
        return
    }
}

The second is to hijack the the connection from the server and rudely close the connection:

func handle(w http.ResponseWriter, r *http.Request) {
    if r.UserAgent() == "test/1.0" {
        //Allow
    } else {
        if h, ok := w.(http.Hijacker); ok {
            c, _, err := h.Hijack()
            if err != nil {
                c.Close()
                return
            }
        }
        // fallback to error response
        http.Error(w, "forbidden", http.StatusForbidden)
        return
    }
}

answered Apr 25, 2021 at 20:13

user5728991

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