Updates hashicorp/go-cleanhttp to pick up new sanitizer.

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,

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
+	})
+}

vendor/vendor.json

@@ -24,7 +24,7 @@
 		{"path":"github.com/google/gofuzz","checksumSHA1":"PFtXkXPO7pwRtykVUUXtc07wc7U=","revision":"24818f796faf91cd76ec7bddd72458fbced7a6c1","revisionTime":"2017-06-12T17:47:53Z"},
 		{"path":"github.com/hashicorp/errwrap","checksumSHA1":"cdOCt0Yb+hdErz8NAQqayxPmRsY=","revision":"7554cd9344cec97297fa6649b055a8c98c2a1e55","revisionTime":"2014-10-28T05:47:10Z"},
 		{"path":"github.com/hashicorp/go-checkpoint","checksumSHA1":"D267IUMW2rcb+vNe3QU+xhfSrgY=","revision":"1545e56e46dec3bba264e41fde2c1e2aa65b5dd4","revisionTime":"2017-10-09T17:35:28Z"},
-		{"path":"github.com/hashicorp/go-cleanhttp","checksumSHA1":"b8F628srIitj5p7Y130xc9k0QWs=","revision":"3573b8b52aa7b37b9358d966a898feb387f62437","revisionTime":"2017-02-11T01:34:15Z"},
+		{"path":"github.com/hashicorp/go-cleanhttp","checksumSHA1":"YAq1rqZIp+M74Q+jMBQkkMKm3VM=","revision":"d5fe4b57a186c716b0e00b8c301cbd9b4182694d","revisionTime":"2017-12-18T14:54:08Z"},
 		{"path":"github.com/hashicorp/go-discover","checksumSHA1":"Ks9Bo8kevhaI5xTRdw1lULNMoOA=","revision":"c98e36ab72ce62b7d8fbc7f7e76f9a60e163cb45","revisionTime":"2017-10-30T10:26:55Z"},
 		{"path":"github.com/hashicorp/go-discover/provider/aliyun","checksumSHA1":"ZmU/47XUGUQpFP6E8T6Tl8QKszI=","revision":"c98e36ab72ce62b7d8fbc7f7e76f9a60e163cb45","revisionTime":"2017-10-30T10:26:55Z","tree":true},
 		{"path":"github.com/hashicorp/go-discover/provider/aws","checksumSHA1":"lyPRg8aZKgGiNkMILk/VKwOqMy4=","revision":"c98e36ab72ce62b7d8fbc7f7e76f9a60e163cb45","revisionTime":"2017-10-30T10:26:55Z","tree":true},