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// Return a PNG, saving an array of query strings we see as state. When query
// string is 'status', return array as JSON
function handleRequest(request, response) {
var seenImages = getState("seenImages");
seenImages = seenImages ? JSON.parse(seenImages) : [];
response.setHeader("Cache-Control", "must-revalidate", false);
if (request.queryString == "status") {
response.setHeader("Content-Type", "text/javascript", false);
response.write(JSON.stringify(seenImages));
} else if (request.queryString == "reset") {
// Respond with how many requests we had seen, drop them
response.setHeader("Content-Type", "text/plain", false);
response.write(String(seenImages.length));
seenImages = [];
} else {
// Return an image
response.setStatusLine("1.1", 302, "Found");
response.setHeader("Location", "blue.png", false);
dump(request.queryString + "\n");
seenImages.push(request.queryString);
}
setState("seenImages", JSON.stringify(seenImages));
}