Go is a great language for writing simple and efficient network applications. Here is how we can build a basic HTTP proxy in Go in under 20 lines of code.
First we import the packages we need:
import (
"net/http"
"net/url"
"io"
"log"
)
Next we create a HandleProxy func to handle each request:
func HandleProxy(w http.ResponseWriter, r *http.Request) {
// proxy logic
}
Inside the handler we:
We put this together in a main function to start the proxy server:
func main() {
http.HandleFunc("/", HandleProxy)
log.Fatal(http.ListenAndServe(":8080", nil))
}
The full code for our 20 line HTTP proxy in Go:
import (
"net/http"
"net/url"
"io"
"log"
)
func HandleProxy(w http.ResponseWriter, r *http.Request) {
dest_url, _ := url.Parse(r.URL.String())
res, _ := http.Get(dest_url.String())
io.Copy(w, res.Body)
}
func main() {
http.HandleFunc("/", HandleProxy)
log.Fatal(http.ListenAndServe(":8080", nil))
}
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