HTTP: close connection on connection:close header.

rnewson found a good bug in keep-alive. we were only using the request
headers we send to enable/disable keep-alive but when the server sends
Connection: close we need to close down the connection regardless.

I wrote up a patch the Robert verified makes all his test client code work
now and I also added a new unittest for it.

lib/http.js

@@ -858,6 +858,10 @@ function Client ( ) {
       // A major oversight in HTTP. Hence this nastiness.
       var isHeadResponse = req.method == "HEAD";
       debug('isHeadResponse ' + isHeadResponse);
+
+      if (req.shouldKeepAlive && res.headers.connection === 'close') {
+        req.shouldKeepAlive = false;
+      }
 
       res.addListener('end', function ( ) {
         debug("request complete disconnecting. readyState = " + self.readyState);

test/simple/test-http-keep-alive-close-on-header.js

@@ -0,0 +1,49 @@
+common = require("../common");
+assert = common.assert
+
+assert = require("assert");
+http = require("http");
+sys = require("sys");
+
+body = "hello world\n";
+headers = {'connection':'keep-alive'}
+
+server = http.createServer(function (req, res) {
+  res.writeHead(200, {"Content-Length": body.length, "Connection":"close"});
+  res.write(body);
+  res.end();
+});
+
+connectCount = 0;
+
+server.listen(common.PORT, function () {
+  var client = http.createClient(common.PORT);
+
+  client.addListener("connect", function () {
+    common.error("CONNECTED")
+    connectCount++;
+  })
+
+  var request = client.request("GET", "/", headers);
+  request.end();
+  request.addListener('response', function (response) {
+    common.error('response start');
+
+
+    response.addListener("end", function () {
+      common.error('response end');
+      var req = client.request("GET", "/", headers);
+      req.addListener('response', function (response) {
+        response.addListener("end", function () {
+          client.end();
+          server.close();
+        })
+      })
+      req.end();
+    });
+  });
+});
+
+process.addListener('exit', function () {
+  assert.equal(2, connectCount);
+});