HttpClient5与HttpCore5 Debug

依赖

• SpringBoot：3.5.12
• HttpClient5：5.6.1

发生场景

执行restTemplate.exchange(url, HttpMethod.GET, entity, NodeListResponse.class).getBody()时报错：

java.lang.ClassNotFoundException: org.apache.hc.core5.io.IOFunction

修复

查看HttpCore5的版本：

$ mvn dependency:tree

[INFO] ...
[INFO] \- org.apache.httpcomponents.client5:httpclient5:jar:5.6.1:compile
[INFO]    +- org.apache.httpcomponents.core5:httpcore5:jar:5.3.6:compile
[INFO]    +- org.apache.httpcomponents.core5:httpcore5-h2:jar:5.3.6:compile
[INFO]    \- org.slf4j:slf4j-api:jar:2.0.17:compile
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  10.139 s
[INFO] Finished at: 2026-04-24T19:20:35+08:00
[INFO] ------------------------------------------------------------------------

可以看到HttpCore5是由HttpClient5引入的，版本为5.3.6

查询资料后得知Core的5.3.6版本最好配套Client5的5.5.2版本

最终确定的版本：

• HttpCore5：5.3.6
• HttpClient5：5.5.2