前言

最近在做私人项目，使用了微服务spring cloud，其中有一个所有请求的总入口，即api网关，使用了zuul做路由，不同的请求路由到不同的微服务中。

问题

在开发的时候遇到一个有关文件上传的问题，文件上传方法在其他微服务中，在通过网关转发的时候，微服务中对应的方法出现了如下的错误：

    [23:01:11:087] [ERROR] - org.apache.juli.logging.DirectJDKLog.log(DirectJDKLog.java:182) - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is java.io.IOException: org.apache.tomcat.util.http.fileupload.FileUploadException: Unexpected EOF read on the socket] with root cause java.io.EOFException: Unexpected EOF read on the socket at org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:716) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.coyote.http11.Http11InputBuffer.access$300(Http11InputBuffer.java:40) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.coyote.http11.Http11InputBuffer$SocketInputBuffer.doRead(Http11InputBuffer.java:1043) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:102) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.coyote.http11.Http11InputBuffer.doRead(Http11InputBuffer.java:243) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.coyote.Request.doRead(Request.java:551) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:318) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.connector.InputBuffer.checkByteBufferEof(InputBuffer.java:611) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:341) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:132) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at java.io.FilterInputStream.read(FilterInputStream.java:133) ~
    [?:1.8.0_131] at org.apache.tomcat.util.http.fileupload.util.LimitedInputStream.read(LimitedInputStream.java:132) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.http.fileupload.MultipartStream$ItemInputStream.makeAvailable(MultipartStream.java:977) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.http.fileupload.MultipartStream$ItemInputStream.read(MultipartStream.java:881) ~[tomcat-embed-core-9.0.7.jar:9.0.7] at java.io.InputStream.read(InputStream.java:101) ~
    [?:1.8.0_131] at org.apache.tomcat.util.http.fileupload.util.Streams.copy(Streams.java:98) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.http.fileupload.util.Streams.copy(Streams.java:68) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.http.fileupload.MultipartStream.readBodyData(MultipartStream.java:572) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.http.fileupload.MultipartStream.discardBodyData(MultipartStream.java:596) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.http.fileupload.MultipartStream.skipPreamble(MultipartStream.java:614) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.findNextItem(FileUploadBase.java:865) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.(FileUploadBase.java:845) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:256) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:280) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.connector.Request.parseParts(Request.java:2804) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.connector.Request.parseParameters(Request.java:3148) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.connector.Request.getParameter(Request.java:1109) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:381) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:75) ~
    [spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~
    [spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~
    [spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~
    [spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:407) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) 
    [tomcat-embed-core-9.0.7.jar:9.0.7] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    [?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_131] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.7.jar:9.0.7] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]

后又直接调用微服务中的方法，可以正常执行，所以基本可以定位问题出在网关这里，经过查询和测试，应该是网关 这里的超时时间太短导致的错误。

解决

在网关的配置文件中将超时时间设置长点：

hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=600000
ribbon.ConnectTimeout=10000
ribbon.ReadTimeout=10000

注意

使用zuul的时候，有一点需要注意，当转发的接口是post方式，并且传参方式为form-data或者x-www-form-urlencode的时候，则zuul的配置中不要添加以下配置，否则参数会传递不过去

zuul.FormBodyWrapperFilter.pre.disable=true