http: always cork outgoing writes

PR-URL: #13522
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>

benchmark/fixtures/simple-http-server.js

@@ -27,13 +27,14 @@ module.exports = http.createServer(function(req, res) {
     dom.add(res);
   }
 
-  // URL format: /<type>/<length>/<chunks>/<responseBehavior>
+  // URL format: /<type>/<length>/<chunks>/<responseBehavior>/chunkedEnc
   var params = req.url.split('/');
   var command = params[1];
   var body = '';
   var arg = params[2];
   var n_chunks = parseInt(params[3], 10);
   var resHow = (params.length >= 5 ? params[4] : 'normal');
+  var chunkedEnc = (params.length >= 6 && params[5] === 'false' ? false : true);
   var status = 200;
 
   var n, i;
@@ -95,48 +96,43 @@ module.exports = http.createServer(function(req, res) {
 
   // example: http://localhost:port/bytes/512/4
   // sends a 512 byte body in 4 chunks of 128 bytes
-  if (n_chunks > 0) {
-    switch (resHow) {
-      case 'setHeader':
-        res.statusCode = status;
-        res.setHeader('Content-Type', 'text/plain');
+  var len = body.length;
+  switch (resHow) {
+    case 'setHeader':
+      res.statusCode = status;
+      res.setHeader('Content-Type', 'text/plain');
+      if (chunkedEnc)
         res.setHeader('Transfer-Encoding', 'chunked');
-        break;
-      case 'setHeaderWH':
-        res.setHeader('Content-Type', 'text/plain');
+      else
+        res.setHeader('Content-Length', len.toString());
+      break;
+    case 'setHeaderWH':
+      res.setHeader('Content-Type', 'text/plain');
+      if (chunkedEnc)
         res.writeHead(status, { 'Transfer-Encoding': 'chunked' });
-        break;
-      default:
+      else
+        res.writeHead(status, { 'Content-Length': len.toString() });
+      break;
+    default:
+      if (chunkedEnc) {
         res.writeHead(status, {
           'Content-Type': 'text/plain',
           'Transfer-Encoding': 'chunked'
         });
-    }
-    // send body in chunks
-    var len = body.length;
+      } else {
+        res.writeHead(status, {
+          'Content-Type': 'text/plain',
+          'Content-Length': len.toString()
+        });
+      }
+  }
+  // send body in chunks
+  if (n_chunks > 1) {
     var step = Math.floor(len / n_chunks) || 1;
-
-    for (i = 0, n = (n_chunks - 1); i < n; ++i) {
+    for (i = 0, n = (n_chunks - 1); i < n; ++i)
       res.write(body.slice(i * step, i * step + step));
-    }
     res.end(body.slice((n_chunks - 1) * step));
   } else {
-    switch (resHow) {
-      case 'setHeader':
-        res.statusCode = status;
-        res.setHeader('Content-Type', 'text/plain');
-        res.setHeader('Content-Length', body.length.toString());
-        break;
-      case 'setHeaderWH':
-        res.setHeader('Content-Type', 'text/plain');
-        res.writeHead(status, { 'Content-Length': body.length.toString() });
-        break;
-      default:
-        res.writeHead(status, {
-          'Content-Type': 'text/plain',
-          'Content-Length': body.length.toString()
-        });
-    }
     res.end(body);
   }
 });

benchmark/http/simple.js

@@ -6,8 +6,9 @@ var bench = common.createBenchmark(main, {
   // unicode confuses ab on os x.
   type: ['bytes', 'buffer'],
   len: [4, 1024, 102400],
-  chunks: [0, 1, 4],  // chunks=0 means 'no chunked encoding'.
+  chunks: [1, 4],
   c: [50, 500],
+  chunkedEnc: ['true', 'false'],
   res: ['normal', 'setHeader', 'setHeaderWH']
 });
 
@@ -16,7 +17,8 @@ function main(conf) {
   var server = require('../fixtures/simple-http-server.js')
   .listen(process.env.PORT || common.PORT)
   .on('listening', function() {
-    var path = `/${conf.type}/${conf.len}/${conf.chunks}/${conf.res}`;
+    var path =
+      `/${conf.type}/${conf.len}/${conf.chunks}/${conf.res}/${conf.chunkedEnc}`;
 
     bench.http({
       path: path,

lib/_http_outgoing.js

@@ -660,18 +660,18 @@ function write_(msg, chunk, encoding, callback, fromEnd) {
   // signal the user to keep writing.
   if (chunk.length === 0) return true;
 
+  if (!fromEnd && msg.connection && !msg.connection.corked) {
+    msg.connection.cork();
+    process.nextTick(connectionCorkNT, msg.connection);
+  }
+
   var len, ret;
   if (msg.chunkedEncoding) {
     if (typeof chunk === 'string')
       len = Buffer.byteLength(chunk, encoding);
     else
       len = chunk.length;
 
-    if (msg.connection && !msg.connection.corked) {
-      msg.connection.cork();
-      process.nextTick(connectionCorkNT, msg.connection);
-    }
-
     msg._send(len.toString(16), 'latin1', null);
     msg._send(crlf_buf, null, null);
     msg._send(chunk, encoding, null);