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我项目采用微服务架构，所以各服务之间通过Spring RestClient远程调用，本来一直工作得好好的，昨天突然发现远程调用一直报错，错误详情如下：

org.springframework.web.client.HttpClientErrorException$BadRequest: 400 Bad Request: [no body]at org.springframework.web.client.HttpClientErrorException.create(HttpClientErrorException.java:103) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.client.StatusHandler.lambda$defaultHandler$3(StatusHandler.java:86) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.client.StatusHandler.handle(StatusHandler.java:146) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.client.DefaultRestClient$DefaultResponseSpec.applyStatusHandlers(DefaultRestClient.java:680) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.client.DefaultRestClient.readWithMessageConverters(DefaultRestClient.java:200) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.client.DefaultRestClient$DefaultResponseSpec.readBody(DefaultRestClient.java:667) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.client.DefaultRestClient$DefaultResponseSpec.body(DefaultRestClient.java:621) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.client.support.RestClientAdapter.exchangeForBody(RestClientAdapter.java:73) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.service.invoker.HttpServiceMethod$ExchangeResponseFunction.lambda$create$4(HttpServiceMethod.java:379) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.service.invoker.HttpServiceMethod$ExchangeResponseFunction.execute(HttpServiceMethod.java:336) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.service.invoker.HttpServiceMethod.invoke(HttpServiceMethod.java:130) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.web.service.invoker.HttpServiceProxyFactory$HttpServiceMethodInterceptor.invoke(HttpServiceProxyFactory.java:303) ~[spring-web-6.1.5.jar!/:6.1.5]at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.1.5.jar!/:6.1.5]at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:220) ~[spring-aop-6.1.5.jar!/:6.1.5]at jdk.proxy3/jdk.proxy3.$Proxy184.getLoginUser(Unknown Source) ~[na:na]at com.ibm.risk.irmp.common.auth.JWTFilter.doFilter(JWTFilter.java:66) ~[irmp-common-2.1.0-SNAPSHOT.jar!/:na]

服务端打开最低级日志，发现报错说是Request Parse Error: Invalid Headers
但这两天也没改远程调用的代码呀！仔细查看了文请求header，也没发现异常，
把代码退回到前天版本发现正常。
仔细回想了一下，既然没改代码，那估计是依赖的问题吧？排查了一下，昨天加了一个华为云存储桶的依赖：

        <dependency><groupId>com.huaweicloud</groupId><artifactId>esdk-obs-java</artifactId><version>3.23.9.1</version></dependency>

再看看esdk-obs-java又依赖了okhttp，那么很可能是Spring检测到有okhttp就优先使用okhttp了吧？
把esdk-obs-java去掉一测，果然正常了。
哼哼，原来okhttp还有这问题，于是把spring restclient 初始化直接指定一个httpclient:

RestClient restClient = RestClient.builder().requestFactory(new ReactorNettyClientRequestFactory()).baseUrl(url).build();

再加上esdk-obs-java依赖，测试一切平静如常了