✨ ignore falsy header keys, matching node behavior

Author: ctcpip

index.js

@@ -79,10 +79,15 @@ function onHeaders (res, listener) {
  */
 
 function setHeadersFromArray (res, headers) {
+  var key
+
   if (headers.length && Array.isArray(headers[0])) {
     // 2D
     for (var i = 0; i < headers.length; i++) {
-      res.setHeader(headers[i][0], headers[i][1])
+      key = headers[i][0]
+      if (key) {
+        res.setHeader(key, headers[i][1])
+      }
     }
   } else {
     // 1D
@@ -96,11 +101,17 @@ function setHeadersFromArray (res, headers) {
       }
 
       for (var k = 0; k < headers.length; k += 2) {
-        res.appendHeader(headers[k], headers[k + 1])
+        key = headers[k]
+        if (key) {
+          res.appendHeader(key, headers[k + 1])
+        }
       }
     } else {
       for (var l = 0; l < headers.length; l += 2) {
-        res.setHeader(headers[l], headers[l + 1])
+        key = headers[l]
+        if (key) {
+          res.setHeader(key, headers[l + 1])
+        }
       }
     }
   }

test/test.js

@@ -280,6 +280,21 @@ describe('onHeaders(res, listener)', function () {
         .expect('X-Outgoing-Echo', 'test')
         .expect(201, done)
     })
+
+    it('should ignore empty header key', function (done) {
+      var server = createServer(listener, handler)
+
+      function handler (req, res) {
+        res.writeHead(201, [['', 'test']])
+      }
+
+      function listener (req, res) {
+      }
+
+      request(server)
+        .get('/')
+        .expect(201, done)
+    })
   })
 
   describe('writeHead(status, flat arr)', function () {
@@ -301,6 +316,21 @@ describe('onHeaders(res, listener)', function () {
         .expect('X-Outgoing-Echo', 'test')
         .expect(201, done)
     })
+
+    it('should ignore empty header key', function (done) {
+      var server = createServer(listener, handler)
+
+      function handler (req, res) {
+        res.writeHead(201, ['', 'test'])
+      }
+
+      function listener (req, res) {
+      }
+
+      request(server)
+        .get('/')
+        .expect(201, done)
+    })
   })
 
   describe('writeHead(status, invalid flat arr)', function () {