CODEWITHSUNDEEP
goproxyserver
John Smith
John Smith

Reputation: 453

Proxy request host is overwritten by the real request

I am trying to serve a proxy like this:

package main

import (
    "net/http"
)

func main() {
    http.ListenAndServe(":8080", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        println(r.Host)
    }))
}

and calling it with curl

curl -k -x http://localhost:8080 http://golang.org/

I get golang.org printed out. Why I do not get the proxy hostname localhost? is that a bug or limitation with the http proxy?

Update

To clarify, what I am looking for is something like Nginx server address http://nginx.org/en/docs/http/ngx_http_core_module.html#var_server_addr

Upvotes: 1

Views: 266

Answers (1)

John Smith
John Smith

Reputation: 453

I should use LocalAddrContextKey but looks like there is a known bug with setting it https://github.com/golang/go/issues/18686 A workaround is to hijack the http.ResponseWriter ex: 

package main

import (
    "net/http"
)

func main() {
    http.ListenAndServe(":8080", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

        hij, ok := w.(http.Hijacker)
        if !ok {
            panic("http server does not support hijacker")
        }

        clientConn, _, err := hij.Hijack()
        if err != nil {
            panic(err.Error())
        }

        println(clientConn.LocalAddr().String())

    }))
}

Upvotes: 1

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