1 files changed, 10 insertions, 1 deletions
diff --git a/lib/_http_agent.js b/lib/_http_agent.js
index e1cfa6d7fc..25ff16fea1 100644
--- a/lib/_http_agent.js
+++ b/lib/_http_agent.js
@@ -27,7 +27,11 @@ const net = require('net');
 const EventEmitter = require('events');
 const debug = require('internal/util/debuglog').debuglog('http');
 const { async_id_symbol } = require('internal/async_hooks').symbols;
-
+const {
+  codes: {
+    ERR_INVALID_ARG_TYPE,
+  },
+} = require('internal/errors');
 // New Agent code.
 
 // The largest departure from the previous implementation is that
@@ -240,6 +244,11 @@ function calculateServerName(options, req) {
   let servername = options.host;
   const hostHeader = req.getHeader('host');
   if (hostHeader) {
+    if (typeof hostHeader !== 'string') {
+      throw new ERR_INVALID_ARG_TYPE('options.headers.host',
+                                     'String', hostHeader);
+    }
+
     // abc => abc
     // abc:123 => abc
     // [::1] => ::1