fix(cloud-sql): added return statements to fix 'http headers sent' error (#1883)

fixes #1882

Author: shubha-rajan

cloud-sql/mysql/mysql/server.js

@@ -192,7 +192,7 @@ app.post('/', async (req, res) => {
   const timestamp = new Date();
 
   if (!team || (team !== 'TABS' && team !== 'SPACES')) {
-    res.status(400).send('Invalid team specified.').end();
+    return res.status(400).send('Invalid team specified.').end();
   }
 
   // [START cloud_sql_mysql_mysql_connection]
@@ -206,7 +206,7 @@ app.post('/', async (req, res) => {
     // involve retrying or adjusting parameters depending on the situation.
     // [START_EXCLUDE]
     logger.error(err);
-    res
+    return res
       .status(500)
       .send(
         'Unable to successfully cast vote! Please check the application logs for more details.'

cloud-sql/sqlserver/mssql/server.js

@@ -175,7 +175,7 @@ app.post('/', async (req, res, next) => {
   const timestamp = new Date();
 
   if (!team || (team !== 'TABS' && team !== 'SPACES')) {
-    res.status(400).send('Invalid team specified.').end();
+    return res.status(400).send('Invalid team specified.').end();
   }
 
   // [START cloud_sql_server_mssql_connection]
@@ -199,7 +199,7 @@ app.post('/', async (req, res, next) => {
     // [START_EXCLUDE]
 
     logger.error(err);
-    res
+    return res
       .status(500)
       .send(
         'Unable to successfully cast vote! Please check the application logs for more details.'