代码如下：

//转发流的方式
HttpURLConnection conn = null;
InputStream inputStream = null;
ServletOutputStream outputStream = null;
try {
    URL url = new URL(urlStr);
    conn = (HttpURLConnection) url.openConnection();
    int responseCode = conn.getResponseCode();
    log.info("responseCode :{}", responseCode);
    conn.setConnectTimeout(300000);
    conn.setReadTimeout(300000);
    
    inputStream = conn.getInputStream();
    outputStream = response.getOutputStream();
    IOUtils.copy(inputStream, outputStream);
} catch (Exception e) {
    log.error("获取图片错误", e);
    response.setStatus(500);
    if (outputStream == null) {
        try {
            outputStream = response.getOutputStream();
            outputStream.println("get image erro , please try again test");
            outputStream.flush();
        } catch (IOException ex) {
            ex.printStackTrace();
        }finally {
            IOUtils.closeQuietly((Closeable) outputStream);
        }
    }
} finally {
    IOUtils.closeQuietly((Closeable) inputStream);
    IOUtils.closeQuietly((Closeable) outputStream);
}


错误
org.apache.catalina.connector.ClientAbortException: java.io.IOException: Connection reset by peer
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:351)
at org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputBuffer.java:776)
at org.apache.catalina.connector.OutputBuffer.append(OutputBuffer.java:681)
at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:386)
at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:364)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:96)
at org.apache.tomcat.util.http.fileupload.IOUtils.copyLarge(IOUtils.java:171)
at org.apache.tomcat.util.http.fileupload.IOUtils.copy(IOUtils.java:141)
at com.yitu.picture.service.PictureService.forwardingPictureQuest(PictureService.java:97)
at com.yitu.picture.controller.PictureController.forwardingPictureQuest(PictureController.java:24)
at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)

如果加上每次断开链接
conn.setRequestProperty("Connection", "close");

错误变成：