feature/Force HTTP1 functionality

js/runner.go

@@ -31,6 +31,7 @@ import (
 	"net"
 	"net/http"
 	"net/http/cookiejar"
+	"os"
 	"runtime/debug"
 	"strconv"
 	"strings"
@@ -210,7 +211,12 @@ func (r *Runner) newVU(idLocal, idGlobal uint64, samplesOut chan<- stats.SampleC
 		MaxIdleConns:        int(r.Bundle.Options.Batch.Int64),
 		MaxIdleConnsPerHost: int(r.Bundle.Options.BatchPerHost.Int64),
 	}
-	_ = http2.ConfigureTransport(transport)
+
+	if ForceHTTP1() {
+		transport.TLSNextProto = map[string]func(string, *tls.Conn) http.RoundTripper{} //send over h1 protocol
+	} else {
+		_ = http2.ConfigureTransport(transport) //send over h2 protocol
+	}
 
 	cookieJar, err := cookiejar.New(nil)
 	if err != nil {
@@ -262,6 +268,23 @@ func (r *Runner) newVU(idLocal, idGlobal uint64, samplesOut chan<- stats.SampleC
 	return vu, nil
 }
 
+// Will check if force http1 env variable has been set in order to force requests to be sent over h1
+// This feature is temporary until #936 is resolved
+func ForceHTTP1() bool {
+	godebug := os.Getenv("GODEBUG")
+	if godebug == "" {
+		return false
+	}
+	variables := strings.SplitAfter(godebug, ",")
+
+	for _, v := range variables {
+		if strings.Trim(v, ",") == "http2client=0" {
+			return true
+		}
+	}
+	return false
+}
+
 // Setup runs the setup function if there is one and sets the setupData to the returned value
 func (r *Runner) Setup(ctx context.Context, out chan<- stats.SampleContainer) error {
 	setupCtx, setupCancel := context.WithTimeout(ctx, r.getTimeoutFor(consts.SetupFn))

lib/netext/httpext/transport_test.go

@@ -26,9 +26,9 @@ import (
 	"net/url"
 	"testing"
 
+	"github.com/sirupsen/logrus"
 	"go.k6.io/k6/lib"
 	"go.k6.io/k6/stats"
-	"github.com/sirupsen/logrus"
 )
 
 func BenchmarkMeasureAndEmitMetrics(b *testing.B) {