fixup

lib/_http_outgoing.js

@@ -53,6 +53,7 @@ const {
     ERR_HTTP_TRAILER_INVALID,
     ERR_INVALID_HTTP_TOKEN,
     ERR_INVALID_ARG_TYPE,
+    ERR_INVALID_ARG_VALUE,
     ERR_INVALID_CHAR,
     ERR_METHOD_NOT_IMPLEMENTED,
     ERR_STREAM_CANNOT_PIPE,
@@ -386,6 +387,10 @@ function _storeHeader(firstLine, headers) {
           processHeader(this, state, entry[0], entry[1], true);
         }
       } else {
+        if (headers.length % 2 !== 0) {
+          throw new ERR_INVALID_ARG_VALUE('headers', headers);
+        }
+
         for (let n = 0; n < headers.length; n += 2) {
           processHeader(this, state, headers[n + 0], headers[n + 1], true);
         }

lib/_http_server.js

@@ -276,15 +276,15 @@ function writeHead(statusCode, reason, obj) {
   }
   this.statusCode = statusCode;
 
-  if (ArrayIsArray(obj) && obj.length % 2 !== 0) {
-    throw new ERR_INVALID_ARG_VALUE('headers', obj);
-  }
-
   let headers;
   if (this[kOutHeaders]) {
     // Slow-case: when progressive API and header fields are passed.
     let k;
     if (ArrayIsArray(obj)) {
+      if (obj.length % 2 !== 0) {
+        throw new ERR_INVALID_ARG_VALUE('headers', obj);
+      }
+
       for (let n = 0; n < obj.length; n += 2) {
         k = obj[n + 0];
         if (k) this.setHeader(k, obj[n + 1]);