springboot URL带有斜杠的转义字符百分之2F导致的400错误
今天项目上出现一个问题,是前端的GET请求url中带有路径参数,这个参数中有/这个特殊字符,前端已经转移成了%2F,后端用的是springboot,并没有收到这个请求,直接返回了400的错误
原因
据说是tomcat默认是不支持转义的,需要手动设置一下转化,这个搜索tomcat的设置可以找到,但是这个是springboot,有内置的tomcat,但是在yml中找不到相关的配置。
解决方式
修改一下启动类,加一个系统参数,重写WebMvcConfigurerAdapter的configurePathMatch方法
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@SpringBootApplication
public class Application extends WebMvcConfigurerAdapter {
public static void main(String[] args) throws Exception {
System.setProperty( "org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH" , "true" );
SpringApplication.run(Application. class , args);
}
@Override
public void configurePathMatch(PathMatchConfigurer configurer) {
UrlPathHelper urlPathHelper = new UrlPathHelper();
urlPathHelper.setUrlDecode( false );
configurer.setUrlPathHelper(urlPathHelper);
}
}
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springboot 1.x 2.x tomcat支持特殊字符
URL中有{}[]等报400
现象
正常访问一个get请求,页面返回400:
后台日志报错:
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2018 - 08 - 09 21 : 39 : 28.915 INFO 6750 --- [nio- 8080 -exec- 1 ] o.apache.coyote.http11.Http11Processor : Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986
at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java: 479 ) ~[tomcat-embed-core- 8.5 . 32 .jar: 8.5 . 32 ]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java: 684 ) ~[tomcat-embed-core- 8.5 . 32 .jar: 8.5 . 32 ]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java: 66 ) [tomcat-embed-core- 8.5 . 32 .jar: 8.5 . 32 ]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java: 800 ) [tomcat-embed-core- 8.5 . 32 .jar: 8.5 . 32 ]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java: 1471 ) [tomcat-embed-core- 8.5 . 32 .jar: 8.5 . 32 ]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java: 49 ) [tomcat-embed-core- 8.5 . 32 .jar: 8.5 . 32 ]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java: 1142 ) [na: 1.8 .0_111]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java: 617 ) [na: 1.8 .0_111]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java: 61 ) [tomcat-embed-core- 8.5 . 32 .jar: 8.5 . 32 ]
at java.lang.Thread.run(Thread.java: 745 ) [na: 1.8 .0_111]
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稍微百度一下就可以知道这是URL中有特殊字符,新版本的Tomcat严格按照RFC 3986规范进行访问解析,而 RFC 3986规范规定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(RFC3986/7320中指定了以下字符为保留字符:! * ' ( ) ; : @ & = + $ , / ? # [ ]) 。
3.2.6. Field Value Components Most HTTP header field values are defined using common syntax components (token, quoted-string, and comment) separated by whitespace or specific delimiting characters. Delimiters are chosen from the set of US-ASCII visual characters not allowed in a token (DQUOTE and “(),/:;<=>?@[]{}”).
所以这个问题特别容易出现在升级spring boot版本的时候,spring boot内嵌的tomcat也会升级,老版的tomcat运行正常,新版的tomcat就会出错。而深究特殊字符来源,一般是get请求中包含json字符串、搜索特殊字符关键字等。
解决方案
如果是在开发新业务过程中出现这个问题,可以选择新的方案,避免在GET请求中使用! * ' ( ) ; : @ & = + $ , / ? # [ ])等字符,毕竟符合规范是最好的出路。
如果是升级,可以使用下面的方式来解决:
sprintboot 1.x(1.5.21测试有效)
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import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
import org.springframework.boot.context.embedded.tomcat.TomcatConnectorCustomizer;
import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* Create by IntelliJ IDEA
*
* @author chenlei
* @dateTime 2019/5/23 18:09
* @description TomcatConfig
*/
@Configuration
public class TomcatConfig {
@Bean
public EmbeddedServletContainerCustomizer containerCustomizer() {
return new MyCustomizer();
}
private static class MyCustomizer implements EmbeddedServletContainerCustomizer {
@Override
public void customize(ConfigurableEmbeddedServletContainer factory) {
if (factory instanceof TomcatEmbeddedServletContainerFactory) {
customizeTomcat((TomcatEmbeddedServletContainerFactory) factory);
}
}
void customizeTomcat(TomcatEmbeddedServletContainerFactory factory) {
factory.addConnectorCustomizers((TomcatConnectorCustomizer) connector -> {
connector.setAttribute( "relaxedPathChars" , "<>[\\]^`{|}" );
connector.setAttribute( "relaxedQueryChars" , "<>[\\]^`{|}" );
});
}
}
}
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springboot 2.x(2.1.3测试有效)
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import org.springframework.boot.web.embedded.tomcat.TomcatConnectorCustomizer;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.servlet.server.ServletWebServerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* Create by IntelliJ IDEA
*
* @author chenlei
* @dateTime 2019/5/23 18:09
* @description TomcatConfig
*/
@Configuration
public class TomcatConfig {
@Bean
public ServletWebServerFactory webServerFactory() {
TomcatServletWebServerFactory fa = new TomcatServletWebServerFactory();
fa.addConnectorCustomizers((TomcatConnectorCustomizer) connector -> connector.setProperty( "relaxedQueryChars" , "[]{}" ));
return fa;
}
}
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总结
这次问题出现的原因是升级springboot导致的,因为之前使用的较低版本的springboot(1.5.10.RELEASE),升级到1.5.21.RELEASE后出现了该问题。因为之前在springboot 2.x上遇到过这个问题,因此知道问题所在,但springboot 1.x和2.x的解决方案有一点差异,这里记录一下。
后续
后面再做了一次Tomcat升级,从9.0.21升级到9.0.31,突然又出现这个问题,问题原因是一样的,tomcat对非法字符的控制更加严格了,严格遵循最新的RFC7230,我们除了把所有的非法字符全部加到relaxedQueryChars以外,还添加了另一项配置rejectIllegalHeader:
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@Configuration
public class TomcatConfig {
@Bean
public ServletWebServerFactory webServerFactory() {
TomcatServletWebServerFactory fa = new TomcatServletWebServerFactory();
fa.addConnectorCustomizers(connector -> {
connector.setProperty( "relaxedQueryChars" , "(),/:;<=>?@[\\]{}" );
connector.setProperty( "rejectIllegalHeader" , "false" );
});
return fa;
}
}
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关于这个配置的解释参考:tomcat-9.0-doc
rejectIllegalHeader
If an HTTP request is received that contains an illegal header name or value (e.g. the header name is not a token) this setting determines if the request will be rejected with a 400 response (true) or if the illegal header be ignored (false). The default value is true which will cause the request to be rejected.
这样配置后(1.x的配置类似),大部分URI和Header都可以兼容,但是正如文档里所说的,rejectIllegalHeader会导致非法的header忽略,即header信息将不会被服务器接收。
所以一旦Header里面有非法字符,对应的Header项将被忽略,服务器不会报400,但会跳过这个header项,比如升级过程中我们发现有API在header里传输中文,导致服务启报错,加了rejectIllegalHeader=false后,不报400,但程序找不到对应的Header,最后不得不删除这些不规范的header。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家.
原文链接:https://blog.csdn.net/ColdFireMan/article/details/86552242