node/test/simple/test-http-expect-continue.js

var common = require("../common");
var assert = common.assert;
var http = require("http");

var outstanding_reqs = 0;
var test_req_body = "some stuff...\n";
var test_res_body = "other stuff!\n";
var sent_continue = false;
var got_continue = false;

function handler(req, res) {
  assert.equal(sent_continue, true, "Full response sent before 100 Continue");
  common.debug("Server sending full response...");
  res.writeHead(200, {
      'Content-Type' : 'text/plain',
      "ABCD" : "1"
  });
  res.end(test_res_body);
}

var server = http.createServer(handler);
server.addListener("checkContinue", function(req, res) {
    common.debug("Server got Expect: 100-continue...");
    res.writeContinue();
    sent_continue = true;
    handler(req, res);
});    
server.listen(common.PORT);



server.addListener("listening", function() {
  var client = http.createClient(common.PORT);
  req = client.request("POST", "/world", {
      "Expect": "100-continue",
  });
  common.debug("Client sending request...");
  outstanding_reqs++;
  body = "";
  req.addListener('continue', function () {
      common.debug("Client got 100 Continue...");
      got_continue = true;
      req.end(test_req_body);
  });
  req.addListener('response', function (res) {
    assert.equal(got_continue, true, 
      "Full response received before 100 Continue"
    );
    assert.equal(200, res.statusCode, 
      "Final status code was " + res.statusCode + ", not 200."
    );
    res.setEncoding("utf8");
    res.addListener('data', function (chunk) { body += chunk; });
    res.addListener('end', function () {
      common.debug("Got full response.");
      assert.equal(body, test_res_body, "Response body doesn't match.");
      assert.ok("abcd" in res.headers, "Response headers missing.");
      outstanding_reqs--;
      if (outstanding_reqs == 0) {
        server.close();
        process.exit();
      }        
    });
  });
});