diff --git a/index.js b/index.js
index 5bb7894..2041572 100644
--- a/index.js
+++ b/index.js
@@ -16,6 +16,7 @@ const {
   PROMETHEUS_WITH_METHOD = 'true',
   PROMETHEUS_WITH_STATUS = 'true',
   PROMETHEUS_METRIC_TYPE = 'summary',
+  MAX_HEADER_SIZE = 1048576
 } = process.env
 
 const sleep = promisify(setTimeout);
@@ -189,22 +190,27 @@ app.all('*', (req, res) => {
 
 });
 
-let sslOpts = {
+let httpOpts = {
+  maxHeaderSize: MAX_HEADER_SIZE
+}
+
+let httpsOpts = {
   key: require('fs').readFileSync(process.env.HTTPS_KEY_FILE || 'privkey.pem'),
-  cert: require('fs').readFileSync(process.env.HTTPS_CERT_FILE || 'fullchain.pem')
+  cert: require('fs').readFileSync(process.env.HTTPS_CERT_FILE || 'fullchain.pem'),
+  maxHeaderSize: MAX_HEADER_SIZE
 };
 
 //Whether to enable the client certificate feature
 if(process.env.MTLS_ENABLE){
-    sslOpts = {
+    httpsOpts = {
       requestCert: true,
       rejectUnauthorized: false,
-      ...sslOpts
+      ...httpsOpts
     }
 }
 
-var httpServer = http.createServer(app).listen(process.env.HTTP_PORT || 8080);
-var httpsServer = https.createServer(sslOpts,app).listen(process.env.HTTPS_PORT || 8443);
+var httpServer = http.createServer(httpOpts, app).listen(process.env.HTTP_PORT || 8080);
+var httpsServer = https.createServer(httpsOpts,app).listen(process.env.HTTPS_PORT || 8443);
 console.log(`Listening on ports ${process.env.HTTP_PORT || 8080} for http, and ${process.env.HTTPS_PORT || 8443} for https.`);
 
 let calledClose = false;
diff --git a/tests.sh b/tests.sh
index ce94ef0..056f1c4 100755
--- a/tests.sh
+++ b/tests.sh
@@ -176,6 +176,17 @@ else
     exit 1
 fi
 
+message " Make request with a large header."
+LARGE_HEADER_VALUE=$(head -c 10000 </dev/urandom | base64 | tr -d '\n')
+REQUEST=$(curl -s -k -H "Large-Header: $LARGE_HEADER_VALUE" https://localhost:8443/)
+if [ $(echo $REQUEST | jq -r '.headers."large-header"') == "$LARGE_HEADER_VALUE" ]; then
+    passed "Large header test passed."
+else
+    failed "Large header test failed."
+    echo $REQUEST | jq
+    exit 1
+fi
+
 message " Stop containers "
 docker stop http-echo-tests
 sleep 5