踩坑经历之#异常：Error parsing HTTP request header（java）

线上部署项目之后报错，异常如下：

Error parsing HTTP request header
Note: further occurrences of HTTP request parsing errors will be logged at DEBUG level.

java.lang.IllegalArgumentException: Invalid character found in method name [0x160x030x010x020x000x010x000x010xfc0x030x030x880x9b0x080xe8r0x0e0xc1Ftv3p0x000xdd0xdd0xc70xa30x8bP0x0180xdc0xa00xac>0xb10xec0xc5W0xb60xc90x80 ]. HTTP method names must be tokens
at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:419) ~[tomcat-embed-core-9.0.58.jar!/:na]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:271) ~[tomcat-embed-core-9.0.58.jar!/:na]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.58.jar!/:na]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:889) [tomcat-embed-core-9.0.58.jar!/:na]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1735) [tomcat-embed-core-9.0.58.jar!/:na]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.58.jar!/:na]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.58.jar!/:na]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.58.jar!/:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.58.jar!/:na]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0-internal]

 异常原因：

这个问题的原因是高版本tomcat中的新特性：就是严格按照 RFC 3986规范进行访问解析，而 RFC 3986规范定义了Url中只允许包含英文字母（a-zA-Z）、数字（0-9）、-_.~4个特殊字符以及所有保留字符(RFC3986中指定了以下字符为保留字符：! * ’ ( ) ; : @ & = + $ , / ? # [ ])。而我们的系统在通过地址传参时，在url中传了一段json，传入的参数中有"{"不在RFC3986中的保留字段中，所以会报这个错。

 解决方案：

1.换用低版本的Tomcat：使用7.0.69以下版本的Tomcat。（不建议，太麻烦不说，还可能影响到其他的开发）

2. 后台配置请求解析，允许url斜线等特殊字符串

 配置http请求解析

@SpringBootApplication 
public class IntelligentBackApplication{ 
    public static void main(String[] args) {             
      System.setProperty("org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH", "true"); 
      SpringApplication.run(IntelligentBackApplication.class, args); 
} }

webmvc配置路径

@Configuration
public class CorsConfig implements WebMvcConfigurer {
    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) {
        UrlPathHelper urlPathHelper = new UrlPathHelper();
        urlPathHelper.setUrlDecode(false);
        configurer.setUrlPathHelper(urlPathHelper);
    }
}

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