Merge branch '2.0.x' of github.com:spring-cloud/spring-cloud-gateway into 2.0.x

docs/src/main/asciidoc/spring-cloud-gateway.adoc

@@ -953,6 +953,24 @@ spring:
           - cert2.pem
 ----
 
+If the Spring Cloud Gateway is not provisioned with trusted certificates the default trust store is used (which can be overriden with system property javax.net.ssl.trustStore).
+
+=== TLS Handshake
+
+The Gateway maintains a client pool that it uses to route to backends. When communicating over https the client initiates a TLS handshake. A number of timeouts are assoicated with this handshake. These timeouts can be configured (defaults shown):
+
+.application.yml
+[source,yaml]
+----
+spring:
+  cloud:
+    gateway:
+      httpclient:
+        ssl:
+          handshake-timeout-millis: 10000
+          close-notify-flush-timeout-millis: 3000
+          close-notify-read-timeout-millis: 0
+----
 
 == Configuration