diff --git a/lib/basedriver/desired-caps.js b/lib/basedriver/desired-caps.js
index 112a0ca26..a95dafb51 100755
--- a/lib/basedriver/desired-caps.js
+++ b/lib/basedriver/desired-caps.js
@@ -109,6 +109,17 @@ validator.validators.isObject = function isObject (value) {
 
   return 'must be of type object';
 };
+validator.validators.isArray = function isArray (value) {
+  if (Array.isArray(value)) {
+    return null;
+  }
+
+  if (typeof value === 'undefined') {
+    return null;
+  }
+
+  return 'must be of type array';
+};
 validator.validators.deprecated = function deprecated (value, options, key) {
   if (options) {
     log.warn(`${key} is a deprecated capability`);
diff --git a/lib/jsonwp-proxy/proxy.js b/lib/jsonwp-proxy/proxy.js
index 6c23b7d1c..029e71594 100644
--- a/lib/jsonwp-proxy/proxy.js
+++ b/lib/jsonwp-proxy/proxy.js
@@ -159,6 +159,7 @@ class JWProxy {
       const resBodyObj = util.safeJsonParse(resBody);
       if (!this.downstreamProtocol) {
         this.downstreamProtocol = this.getProtocolFromResBody(resBodyObj);
+        log.debug(`Determined that the downstream protocol for proxy is ${this.downstreamProtocol}`);
       }
       if (res.statusCode < 400 && this.downstreamProtocol === MJSONWP && parseInt(resBodyObj.status, 10) !== 0) {
         // Some servers, like chromedriver may return response code 200 for non-zero JSONWP statuses