Account for undefined argument.
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@ -87,7 +87,7 @@ CachingMiddleware.prototype = new function () {
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// Update cache
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var buffer = '';
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Object.keys(headers).forEach(function (key) {
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Object.keys(headers || {}).forEach(function (key) {
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res.setHeader(key, headers[key]);
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});
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headers = _headers;
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