http: fix IPv6 Host header check

PR-URL: https://github.com/nodejs/node/pull/13122
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

lib/_http_client.js

@@ -173,14 +173,14 @@ function ClientRequest(options, cb) {
     }
     if (host && !this.getHeader('host') && setHost) {
       var hostHeader = host;
-      var posColon = -1;
 
       // For the Host header, ensure that IPv6 addresses are enclosed
       // in square brackets, as defined by URI formatting
       // https://tools.ietf.org/html/rfc3986#section-3.2.2
-      if (-1 !== (posColon = hostHeader.indexOf(':')) &&
-          -1 !== (posColon = hostHeader.indexOf(':', posColon)) &&
-          '[' !== hostHeader[0]) {
+      var posColon = hostHeader.indexOf(':');
+      if (posColon !== -1 &&
+          hostHeader.indexOf(':', posColon + 1) !== -1 &&
+          hostHeader.charCodeAt(0) !== 91/*'['*/) {
         hostHeader = `[${hostHeader}]`;
       }
 

test/parallel/test-http-host-header-ipv6-fail.js

@@ -12,28 +12,31 @@
 const common = require('../common');
 const assert = require('assert');
 const http = require('http');
+const net = require('net');
 
-const hostname = '::1';
+const requests = [
+  { host: 'foo:1234', headers: { expectedhost: 'foo:1234:80' } },
+  { host: '::1', headers: { expectedhost: '[::1]:80' } }
+];
 
-function httpreq() {
-  const req = http.request({
-    host: hostname,
-    port: server.address().port,
-    path: '/',
-    method: 'GET'
-  });
-  req.end();
+function createLocalConnection(options) {
+  options.host = undefined;
+  options.port = this.port;
+  options.path = undefined;
+  return net.createConnection(options);
 }
 
-if (!common.hasIPv6) {
-  console.error('Skipping test, no IPv6 support');
-  return;
-}
-
-const server = http.createServer(common.mustCall(function(req, res) {
-  assert.ok(req.headers.host, `[${hostname}]`);
+http.createServer(common.mustCall(function(req, res) {
+  this.requests = this.requests || 0;
+  assert.strictEqual(req.headers.host, req.headers.expectedhost);
   res.end();
-  server.close(true);
-}));
-
-server.listen(0, hostname, () => httpreq());
+  if (++this.requests === requests.length)
+    this.close();
+}, requests.length)).listen(0, function() {
+  const address = this.address();
+  for (let i = 0; i < requests.length; ++i) {
+    requests[i].createConnection =
+      common.mustCall(createLocalConnection.bind(address));
+    http.get(requests[i]);
+  }
+});