Improve fidelity of XHR progress events.

LayoutTests/http/tests/xmlhttprequest/resources/post-echo.php

Index: LayoutTests/http/tests/xmlhttprequest/resources/post-echo.php
diff --git a/LayoutTests/http/tests/xmlhttprequest/resources/post-echo.php b/LayoutTests/http/tests/xmlhttprequest/resources/post-echo.php
new file mode 100644
index 0000000000000000000000000000000000000000..8d180669ec3b798fe40fd46f68e0eb8aa4b72060
--- /dev/null
+++ b/LayoutTests/http/tests/xmlhttprequest/resources/post-echo.php
@@ -0,0 +1,10 @@
+<?php
+if (isset($_POST['type']))
+    header("Content-Type: {$_POST['type']}");
+else
+    header("Content-Type: text/plain");
+
+$str = @file_get_contents('php://input');
+header("Content-Length: " . strlen($str));
+echo $str;
+?>

[tyoshino (SeeGerritForStatus), 2013/11/25 12:35:33]

can't we use LayoutTests/http/tests/xmlhttprequest/resources/post-echo.cgi?

[sof, 2013/11/25 15:28:18]

Considered at some length, but it is even more basic (no Content-Length: .) And
in perl.