PLT-5705 Created a single source of http.Client creation logic with internet proxy support, reasonable timeouts and optional insecure connections (#6503)

utils/httpclient_test.go

@@ -0,0 +1,42 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package utils
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"testing"
+)
+
+func TestHttpClientWithProxy(t *testing.T) {
+	proxy := createProxyServer()
+	defer proxy.Close()
+	os.Setenv("HTTP_PROXY", proxy.URL)
+
+	client := HttpClient()
+	resp, err := client.Get("http://acme.com")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer resp.Body.Close()
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(body) != "proxy" {
+		t.FailNow()
+	}
+}
+
+func createProxyServer() *httptest.Server {
+	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(200)
+		w.Header().Set("Content-Type", "text/plain; charset=us-ascii")
+		fmt.Fprint(w, "proxy")
+	}))
+}