fix(httpx): enforce http11 retry path to avoid h2 fallback (#2240)

Author: sam的电脑

common/httpx/httpx.go

@@ -182,6 +182,10 @@ func New(options *Options) (*HTTPX, error) {
 		Timeout:       httpx.Options.Timeout,
 		CheckRedirect: redirectFunc,
 	}, retryablehttpOptions)
+	if httpx.Options.Protocol == HTTP11 {
+		// Keep retryablehttp-go on HTTP/1.1 as well when it retries internally.
+		httpx.client.HTTPClient2 = httpx.client.HTTPClient
+	}
 
 	transport2 := &http2.Transport{
 		TLSClientConfig: &tls.Config{

common/httpx/httpx_test.go

@@ -28,3 +28,12 @@ func TestDo(t *testing.T) {
 		require.Greater(t, len(resp.Raw), 800)
 	})
 }
+
+func TestHTTP11DisablesRetryableHTTP2Fallback(t *testing.T) {
+	opts := DefaultOptions
+	opts.Protocol = HTTP11
+
+	ht, err := New(&opts)
+	require.NoError(t, err)
+	require.Same(t, ht.client.HTTPClient, ht.client.HTTPClient2)
+}