log download failure caused by missing content length
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@ -216,7 +216,7 @@ public class HttpDownloadConnection implements Transferable {
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String contentLength = connection.getHeaderField("Content-Length");
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connection.disconnect();
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if (contentLength == null) {
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throw new IOException();
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throw new IOException("no content-length found in HEAD response");
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}
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return Long.parseLong(contentLength, 10);
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} catch (IOException e) {
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