webcam-simulacrum.mgif is a hand-edited file containing red.gif and blue.gif, concatenated together with the relevant headers for multipart/x-mixed-replace. Specifically, with the headers in webcam-simulacrum.mjpg^headers^, the web browser will get the following:
HTTP 200 OK Content-Type: multipart/x-mixed-replace;boundary=BOUNDARYOMG
\-\-BOUNDARYOMG\r\n Content-Type: image/gif\r\n \r\n <contents of red.gif> (no newline) \-\-BOUNDARYOMG\r\n Content-Type: image/gif\r\n \r\n <contents of blue.gif> (no newline) \-\-BOUNDARYOMG\-\-\r\n
(The boundary is arbitrary, and just has to be defined as something that won't be in the text of the contents themselves. \-\-$(boundary)\r\n means "Here is the beginning of a boundary," and \-\-$(boundary)\-\- means "All done sending you parts.")
-->
<head>
<title>Test for Bug 641748 - WebCam Simulacrum</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/WindowSnapshot.js"></script>
<script type="application/javascript" src="imgutils.js"></script>
<script type="application/javascript" src="animationPolling.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=641748">
Mozilla Bug 641748: GIF decoder doesn't support multipart/x-mixed-replace
</a>
<p id="display"></p>
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