记一次采坑：org.apache.http.MalformedChunkCodingException: Unexpected content at the end of chunk

开发一个大文件下载功能时，客户端老是报这样的错：

org.apache.http.MalformedChunkCodingException: Unexpected content at the end of chunk
	at org.apache.http.impl.io.ChunkedInputStream.getChunkSize(ChunkedInputStream.java:259) ~[httpcore-4.4.1.jar!/:4.4.1]
	at org.apache.http.impl.io.ChunkedInputStream.nextChunk(ChunkedInputStream.java:227) ~[httpcore-4.4.1.jar!/:4.4.1]
	at org.apache.http.impl.io.ChunkedInputStream.read(ChunkedInputStream.java:186) ~[httpcore-4.4.1.jar!/:4.4.1]
	at org.apache.http.conn.EofSensorInputStream.read(EofSensorInputStream.java:137) ~[httpclient-4.4.1.jar!/:4.4.1]
	at org.apache.http.conn.EofSensorInputStream.read(EofSensorInputStream.java:150) ~[httpclient-4.4.1.jar!/:4.4.1]
	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2146) ~[commons-io-2.5.jar!/:2.5]
	at org.apache.commons.io.IOUtils.copy(IOUtils.java:2102) ~[commons-io-2.5.jar!/:2.5]```

搜了百度谷歌，遇到这种错误的人不多，没啥解决办法。

用游览器访问下载链接，文件正常下载，没问题（暗坑）------

于是怀疑是代码问题。开始以为是httpcore库的版本问题，换了和服务器一样的版本，还是出错，实在没辙了看了ChunkedInputStream的代码，发现read的逻辑没问题啊。

这么了几个小时，实在没辙了，为什么游览器行，代码不行？于是用游览器又下载了一遍，尼码，游览器也开始报网络问题。。。

时灵时不灵，哪有这样的？于是看了下服务器的日志，之前都是看业务日志文件，忽略了catalina.out ，这猛地一看

Caused by: org.apache.catalina.connector.ClientAbortException: java.net.SocketTimeoutException
        at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:356)
        at org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputBuffer.java:815)
        at org.apache.catalina.connector.OutputBuffer.append(OutputBuffer.java:720)
        at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:391)
        at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:369)
        at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:96)
        at org.glassfish.jersey.servlet.internal.ResponseWriter$NonCloseableOutputStreamWrapper.write(ResponseWriter.java:298)
        at org.glassfish.jersey.message.internal.CommittingOutputStream.write(CommittingOutputStream.java:229)
        at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$UnCloseableOutputStream.write(WriterInterceptorExecutor.java:299)
        at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1793)
        at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1769)
        at org.apache.commons.io.IOUtils.copy(IOUtils.java:1744)

看来是tcp超时了，调大客户端请求的tcp超时时间

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又琢磨了2小时，还是没找到超时原因。调大整了客户端请求的TIME_OUT，还是不成功，怀疑是不是服务端设置了相关超时参数，看了下tomcat配置，没发现配置了什么超时参数。

又开始折腾google，发现一个报错堆栈很相似的记录，
https://blog.51cto.com/vekergu/1677437
这个博客上说是ulimit打开文件数太小，好吧！第二天改大点ulimit，再试，游览器成功，postman上请求，postman老是被搞挂，还是有Unexpected content at the end of chunk报错。。。就像这样吧

标签：http,采坑,MalformedChunkCodingException,java,OutputBuffer,IOUtils,io,apache,org
来源： https://blog.csdn.net/heroloveyou/article/details/88941601