Request header is too large 的問題解決

1:問題原因:

後臺接受前臺傳入的內容字符串,由於內容字符串太大,導致打印臺報錯.

1-1:錯誤描述:

java.lang.IllegalArgumentException: Request header is too large
    at org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:701)
    at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:455)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:667)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

1-2:解決方案(服務器容器:tomcat):

1:請求頭超過了tomcat的限值。本來post請求是沒有參數大小限制，但是服務器有自己的默認大小。
2:配置 tomcat的server.xml文件,增加請求字段長度

<Connector port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" maxHttpHeaderSize="102400" maxPostSize="0"  
               URIEncoding="UTF-8"/>

增加maxHttpHeaderSize參數配置,當maxPostSize=0時,表示不限制.

1-3:SpringBoot項目:

在application.yml文件中,配置server.max-http-header-size=102400參數,即可改變內嵌tomcat容器的最大頭大小.

1-4:詳細錯誤原因:

在tomcat的org.apache.coyote.http11.AbstractHttp11Protocol類中定義了其默認值:

    /**
     * Maximum size of the HTTP message header.
     */
    private int maxHttpHeaderSize = 8 * 1024;
    //所以當請求頭大於8*1024時,就會報錯.增對大數據量的請求,需要單獨配置maxHttpHeaderSize參數屬性.