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我使用iframe模擬ajax文件下載，請求轉到tomcat應用程序（servlet）進行文件下載，這是一個耗時的過程（可能需要超過1分鐘），問題是在一定數量時間，無論是tomcat或瀏覽器客戶端終止連接。請參閱下面的Tomcat例外。誰在終止它，客戶端還是服務器？有沒有辦法增加超時時間？tomcat socketTimeout異常
var iframe = document.createElement("iframe");
iframe.src="http://xxxxxxxxx?";
Caused by: ClientAbortException: java.net.SocketException: Broken pipe
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:358)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:434)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:349)
at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:381)
at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:370)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:89)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:83)
at org.apache.poi.poifs.storage.BigBlock.doWriteData(BigBlock.java:55)
at org.apache.poi.poifs.storage.DocumentBlock.writeData(DocumentBlock.java:220)
at org.apache.poi.poifs.storage.BigBlock.writeBlocks(BigBlock.java:86)
at org.apache.poi.poifs.filesystem.POIFSDocument$BigBlockStore.writeBlocks(POIFSDocument.java:603)
at org.apache.poi.poifs.filesystem.POIFSDocument.writeBlocks(POIFSDocument.java:275)
at org.apache.poi.poifs.filesystem.POIFSFileSystem.writeFilesystem(POIFSFileSystem.java:390)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.write(HSSFWorkbook.java:1168)
at net.sf.jasperreports.engine.export.JRXlsExporter.closeWorkbook(JRXlsExporter.java:199)
... 17 more
Caused by: java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)