Fixing UI issues after UI server refactor (#5710)

* Self-sufficient secureApi.

* Updating embed.

* Linting issues.

parity/configuration.rs

@@ -762,10 +762,6 @@ impl Configuration {
 	}
 
 	fn ui_hosts(&self) -> Option<Vec<String>> {
-		if self.args.flag_ui_no_validation {
-			return None;
-		}
-
 		self.hosts(&self.args.flag_ui_hosts, &self.ui_interface())
 	}
 
@@ -774,6 +770,10 @@ impl Configuration {
 	}
 
 	fn ws_hosts(&self) -> Option<Vec<String>> {
+		if self.args.flag_ui_no_validation {
+			return None;
+		}
+
 		self.hosts(&self.args.flag_ws_hosts, &self.ws_interface())
 	}
 
@@ -1486,13 +1486,15 @@ mod tests {
 			port: 8180,
 			hosts: Some(vec![]),
 		});
+		assert!(conf0.ws_config().unwrap().hosts.is_some());
 		assert_eq!(conf1.directories().signer, "signer".to_owned());
 		assert_eq!(conf1.ui_config(), UiConfiguration {
 			enabled: true,
 			interface: "127.0.0.1".into(),
 			port: 8180,
-			hosts: None,
+			hosts: Some(vec![]),
 		});
+		assert_eq!(conf1.ws_config().unwrap().hosts, None);
 		assert_eq!(conf2.directories().signer, "signer".to_owned());
 		assert_eq!(conf2.ui_config(), UiConfiguration {
 			enabled: true,
@@ -1500,6 +1502,7 @@ mod tests {
 			port: 3123,
 			hosts: Some(vec![]),
 		});
+		assert!(conf2.ws_config().unwrap().hosts.is_some());
 		assert_eq!(conf3.directories().signer, "signer".to_owned());
 		assert_eq!(conf3.ui_config(), UiConfiguration {
 			enabled: true,
@@ -1507,6 +1510,7 @@ mod tests {
 			port: 8180,
 			hosts: Some(vec![]),
 		});
+		assert!(conf3.ws_config().unwrap().hosts.is_some());
 	}
 
 	#[test]