Add example networking partially enabled

_examples/networking_partially_enabled/networking.go

@@ -0,0 +1,66 @@
+// This example shows how to enable the networking for a request to a local server
+// and mock a second request to a remote server.
+package main
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+
+	"gopkg.in/h2non/gock.v1"
+)
+
+// Starts a local HTTP server in background
+func startHTTPServer() *httptest.Server {
+	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Println("Local server received a GET request")
+
+		res, err := http.Get("http://httpbin.org/nope")
+		if err != nil {
+			msg := fmt.Sprintf("Error from request to httpbin: %s", err)
+			http.Error(w, msg, http.StatusInternalServerError)
+			return
+		}
+
+		body, _ := ioutil.ReadAll(res.Body)
+		// MUST NOT get original body since the networking
+		// wasn't enabled for this request
+		fmt.Printf("Body From httpbin: %s\n", string(body))
+		fmt.Printf("Status From httpbin: %s\n", res.Status)
+
+		io.WriteString(w, "Local Response="+res.Header.Get("Server"))
+	}))
+}
+
+func main() {
+	defer gock.Disable()
+	defer gock.DisableNetworking()
+
+	srv := startHTTPServer()
+	defer srv.Close()
+
+	// Register our local server
+	gock.New(srv.URL).
+		EnableNetworking()
+
+	gock.New("http://httpbin.org").
+		Get("/nope").
+		Reply(201).
+		SetHeader("Server", "gock")
+
+	res, err := http.Get(srv.URL)
+	if err != nil {
+		fmt.Printf("Error from request to localhost: %s", err)
+		return
+	}
+
+	// The response status comes from the mock
+	fmt.Printf("Status: %d\n", res.StatusCode)
+	// The server header comes from mock as well
+	fmt.Printf("Server header: %s\n", res.Header.Get("Server"))
+	// MUST get original response since the networking was enabled for this request
+	body, _ := ioutil.ReadAll(res.Body)
+	fmt.Printf("Body From Local Server: %s", string(body))
+}