Node 4 breaks making 16kb or greater requests

[geek]

Related to this PR: #2355
In iojs 3.2.0 the following code works, in iojs 3.3.0 and node 4 the following code throws an error.

var Http = require('http');
var Url = require('url');

var server = Http.createServer(function (req, res) {

    res.writeHead(200);
    res.end();
});
server.listen(8080);

var uri = Url.parse('http://localhost:8080/');
uri.method = 'post';
var req = Http.request(uri);

var payload = new Array(1640).join('0123456789');
req.write(payload);
req.end();

Error:

_http_server.js:515
  this._handle.readStart();
              ^

TypeError: Cannot read property 'readStart' of null
    at Socket.onSocketResume (_http_server.js:515:15)
    at emitNone (events.js:67:13)
    at Socket.emit (events.js:166:7)
    at resume_ (_stream_readable.js:712:10)
    at doNTCallback2 (node.js:429:9)
    at process._tickCallback (node.js:343:17)

If you change the payload size to just under 16kb it works:

var Http = require('http');
var Url = require('url');

var server = Http.createServer(function (req, res) {

    res.writeHead(200);
    res.end();
});
server.listen(8080);

var uri = Url.parse('http://localhost:8080/');
uri.method = 'post';
var req = Http.request(uri);

var payload = new Array(1639).join('0123456789');
req.write(payload);
req.end();

[ChALkeR]

First bad commit is 1bc4468 (#2355).
cc @indutny @trevnorris

[ChALkeR]

Btw, the description is a bit incorrect:
new Array(1639).join('0123456789') — ok.
new Array(1640).join('0123456789') — fail.
new Array(6644).join('0123456789') — fail.
new Array(6545).join('0123456789') — ok.

[evanlucas]

Strange, I can't get it to actually throw. It just hangs for me. On which OS are we seeing this?

[ChALkeR]

@evanlucas Mine — Arch Linux x86_64, both self-built and official binaries.

[indutny]

There is definitely a bug, confirmed on my mac. The fix is easy, I just want to be sure that all edge cases are covered.

[indutny]

Fix is here: #2824

[ChALkeR]

It (the original issue, not the fix that was just added) fails on payload lengths exactly from 2^14 to 2^16 - 1. 2^14 is the first bad payload size, 2^16 is the first good payload size after that.

After that, 4481602 is the next bad payload size. That gives a request error, not the server crash.