2 files changed, 44 insertions, 0 deletions
diff --git a/vendor/github.com/hashicorp/go-cleanhttp/cleanhttp.go b/vendor/github.com/hashicorp/go-cleanhttp/cleanhttp.go
index 7d8a57c..8d306bf 100644
--- a/vendor/github.com/hashicorp/go-cleanhttp/cleanhttp.go
+++ b/vendor/github.com/hashicorp/go-cleanhttp/cleanhttp.go
@@ -26,6 +26,7 @@ func DefaultPooledTransport() *http.Transport {
 		DialContext: (&net.Dialer{
 			Timeout:   30 * time.Second,
 			KeepAlive: 30 * time.Second,
+			DualStack: true,
 		}).DialContext,
 		MaxIdleConns:          100,
 		IdleConnTimeout:       90 * time.Second,
diff --git a/vendor/github.com/hashicorp/go-cleanhttp/handlers.go b/vendor/github.com/hashicorp/go-cleanhttp/handlers.go
new file mode 100644
index 0000000..7eda377
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-cleanhttp/handlers.go
@@ -0,0 +1,43 @@
+package cleanhttp
+
+import (
+	"net/http"
+	"strings"
+	"unicode"
+)
+
+// HandlerInput provides input options to cleanhttp's handlers
+type HandlerInput struct {
+	ErrStatus int
+}
+
+// PrintablePathCheckHandler is a middleware that ensures the request path
+// contains only printable runes.
+func PrintablePathCheckHandler(next http.Handler, input *HandlerInput) http.Handler {
+	// Nil-check on input to make it optional
+	if input == nil {
+		input = &HandlerInput{
+			ErrStatus: http.StatusBadRequest,
+		}
+	}
+
+	// Default to http.StatusBadRequest on error
+	if input.ErrStatus == 0 {
+		input.ErrStatus = http.StatusBadRequest
+	}
+
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Check URL path for non-printable characters
+		idx := strings.IndexFunc(r.URL.Path, func(c rune) bool {
+			return !unicode.IsPrint(c)
+		})
+
+		if idx != -1 {
+			w.WriteHeader(input.ErrStatus)
+			return
+		}
+
+		next.ServeHTTP(w, r)
+		return
+	})
+}