diff -r 000000000000 -r 6474c204b198 image/test/reftest/generic/check-header.sjs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/image/test/reftest/generic/check-header.sjs	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,72 @@
+const BinaryOutputStream = Components.Constructor("@mozilla.org/binaryoutputstream;1", "nsIBinaryOutputStream", "setOutputStream");
+
+function isCatchall(v)
+{
+  // "image/*" item exactly or with a quality factor
+  return /^image\/\*(?:|;q=(?:1(?:\.0{0,3})?|0(?:\.\d{0,3})?))$/.test(v);
+}
+
+/*
+# Python used to generate the following byte array
+def toHex(n):
+  if n < 16: return "0x" + hex(n)[2:].upper()
+  return "0x" + hex(n)[2:].upper()
+
+def hexFile(name):
+  f = open(name, "rb")
+  try:
+    while True:
+      print toHex(ord(f.read(1))) + ", ",
+  except:
+    pass
+
+hexFile("image/test/reftest/generic/green.png")
+*/
+
+const IMAGE_DATA =
+  [
+   0x89,  0x50,  0x4E,  0x47,  0x0D,  0x0A,  0x1A,  0x0A,  0x00,  0x00,  0x00,
+   0x0D,  0x49,  0x48,  0x44,  0x52,  0x00,  0x00,  0x00,  0x64,  0x00,  0x00,
+   0x00,  0x64,  0x08,  0x02,  0x00,  0x00,  0x00,  0xFF,  0x80,  0x02,  0x03,
+   0x00,  0x00,  0x00,  0x01,  0x73,  0x52,  0x47,  0x42,  0x00,  0xAE,  0xCE,
+   0x1C,  0xE9,  0x00,  0x00,  0x00,  0x9E,  0x49,  0x44,  0x41,  0x54,  0x78,
+   0xDA,  0xED,  0xD0,  0x31,  0x01,  0x00,  0x00,  0x08,  0x03,  0xA0,  0x69,
+   0xFF,  0xCE,  0x5A,  0xC1,  0xCF,  0x07,  0x22,  0x50,  0x99,  0x70,  0xD4,
+   0x0A,  0x64,  0xC9,  0x92,  0x25,  0x4B,  0x96,  0x2C,  0x05,  0xB2,  0x64,
+   0xC9,  0x92,  0x25,  0x4B,  0x96,  0x02,  0x59,  0xB2,  0x64,  0xC9,  0x92,
+   0x25,  0x4B,  0x81,  0x2C,  0x59,  0xB2,  0x64,  0xC9,  0x92,  0xA5,  0x40,
+   0x96,  0x2C,  0x59,  0xB2,  0x64,  0xC9,  0x52,  0x20,  0x4B,  0x96,  0x2C,
+   0x59,  0xB2,  0x64,  0x29,  0x90,  0x25,  0x4B,  0x96,  0x2C,  0x59,  0xB2,
+   0x14,  0xC8,  0x92,  0x25,  0x4B,  0x96,  0x2C,  0x59,  0x0A,  0x64,  0xC9,
+   0x92,  0x25,  0x4B,  0x96,  0x2C,  0x05,  0xB2,  0x64,  0xC9,  0x92,  0x25,
+   0x4B,  0x96,  0x02,  0x59,  0xB2,  0x64,  0xC9,  0x92,  0x25,  0x4B,  0x81,
+   0x2C,  0x59,  0xB2,  0x64,  0xC9,  0x92,  0xA5,  0x40,  0x96,  0x2C,  0x59,
+   0xB2,  0x64,  0xC9,  0x52,  0x20,  0x4B,  0x96,  0x2C,  0x59,  0xB2,  0x64,
+   0x29,  0x90,  0x25,  0x4B,  0x96,  0x2C,  0x59,  0xB2,  0x14,  0xC8,  0x92,
+   0x25,  0x4B,  0x96,  0x2C,  0x59,  0x0A,  0x64,  0xC9,  0xFA,  0xB6,  0x89,
+   0x5F,  0x01,  0xC7,  0x24,  0x83,  0xB2,  0x0C,  0x00,  0x00,  0x00,  0x00,
+   0x49,  0x45,  0x4E,  0x44,  0xAE,  0x42,  0x60,  0x82,
+  ];
+
+function handleRequest(request, response)
+{
+  response.setHeader("Content-Type", "text/plain", false);
+  response.setHeader("Cache-Control", "no-cache", false);
+
+  var accept = request.hasHeader("Accept")
+             ? request.getHeader("Accept")
+             : "";
+
+  if (accept.split(",").some(isCatchall))
+  {
+    response.setHeader("Content-Type", "image/png", false);
+
+    var stream = new BinaryOutputStream(response.bodyOutputStream);
+    stream.writeByteArray(IMAGE_DATA, IMAGE_DATA.length);
+  }
+  else
+  {
+    response.setStatusLine(request.httpVersion, 404, "Not found");
+    response.write("Accept header contained: " + accept);
+  }
+}