org.springframework.web.reactive.function.client.WebClientRequestException: Search domain query failed. Original hostname: 'DESKTOP-RRQJC6V.mshome.net' failed to resolve 'DESKTOP-RRQJC6V.mshome.net.www.tendawifi.com' after 4 queries ; nested exception is io.netty.resolver.dns.DnsResolveContext$SearchDomainUnknownHostException: Search domain query failed. Original hostname: 'DESKTOP-RRQJC6V.mshome.net' failed to resolve 'DESKTOP-RRQJC6V.mshome.net.www.tendawifi.com' after 4 queries 
    at org.springframework.web.reactive.function.client.ExchangeFunctions$DefaultExchangeFunction.lambda$wrapException$9(ExchangeFunctions.java:141) ~[spring-webflux-5.3.13.jar:5.3.13]
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
    *__checkpoint ⇢ Request to GET health [DefaultWebClient]
Original Stack Trace:
        at org.springframework.web.reactive.function.client.ExchangeFunctions$DefaultExchangeFunction.lambda$wrapException$9(ExchangeFunctions.java:141) ~[spring-webflux-5.3.13.jar:5.3.13]
 

解决办法：

配置正确的情况下，查询到资料是无线网卡的问题。开发时开启飞行模式之后，可解决。台式机应该不会出现此问题。

有些时候，在Windows笔记本电脑上做开发的时候也会碰到这个问题，通常是由于Netty在Windows多网卡环境下做DNS域名解析的时候，选错了网卡导致的。

Windows笔记本电脑通常有一张无线网卡一张有线网卡，用户通常是连WiFi进行开发的，而有时候Netty会误选择有线网卡来做DNS解析，此时也有会碰到这种错误，可以考虑禁用有线网卡。