spring cloud commons 笔记服务发现默认情况下，DiscoveryClient将本地 Spring

服务发现

默认情况下，DiscoveryClient将本地 Spring Boot 服务器自动注册到远程发现服务器的实现。可以通过设置来禁用此autoRegister=false行为@EnableDiscoveryClient。

@EnableDiscoveryClient不再需要。您可以DiscoveryClient在类路径上放置一个实现，以使 Spring Boot 应用程序向服务发现服务器注册。

服务注册

默认情况下，ServiceRegistry实现会自动注册正在运行的服务。要禁用该行为，您可以设置： @EnableDiscoveryClient(autoRegister=false)永久禁用自动注册。spring.cloud.service-registry.auto-registration.enabled=false通过配置禁用该行为。
服务自动注册时将触发两个事件。第一个事件称为 InstancePreRegisteredEvent，在服务注册之前被触发。第二个事件称为InstanceRegisteredEvent，在服务注册后触发。您可以注册一个 ApplicationListener(s) 来收听这些事件并做出反应。

忽略网络接口

配置忽略了docker0接口和所有以开头的接口veth

spring:
  cloud:
    inetutils:
      ignoredInterfaces:
        - docker0
        - veth.*

通过使用正则表达式列表强制仅使用指定的网络地址

spring:
  cloud:
    inetutils:
      preferredNetworks:
        - 192.168
        - 10.0

强制仅使用站点本地地址

spring:
  cloud:
    inetutils:
      useOnlySiteLocalInterfaces: true

HTTP客户端工厂

Spring Cloud Commons 提供了用于创建 Apache HTTP 客户端 ( ApacheHttpClientFactory) 和 OK HTTP 客户端 ( OkHttpClientFactory) 的 bean。仅当OkHttpClientFactoryOK HTTP jar 在类路径上时才会创建 bean。此外，Spring Cloud Commons 提供了用于创建两个客户端使用的连接管理器的 bean：ApacheHttpClientConnectionManagerFactory用于 Apache HTTP 客户端和OkHttpClientConnectionPoolFactoryOK HTTP 客户端。如果您想自定义如何在下游项目中创建 HTTP 客户端，您可以提供自己的这些 bean 实现。另外，如果你提供一个HttpClientBuilderor类型的 bean OkHttpClient.Builder，默认工厂使用这些构建器作为构建器返回到下游项目的基础。您还可以通过设置spring.cloud.httpclientfactories.apache.enabled或spring.cloud.httpclientfactories.ok.enabled来禁用这些 bean 的创建false。添加gradle配置，自动启用OK HTTP 客户端

implementation 'com.squareup.okhttp3:okhttp'

Spring Cloud LoadBalancer缓存

如果您com.github.ben-manes.caffeine:caffeine在类路径中有，将使用基于 Caffeine 的实现。有关如何配置它的信息，请参阅LoadBalancerCacheConfiguration部分。
如果您使用的是咖啡因，您还可以通过在属性中传递您自己的咖啡因规范来覆盖 LoadBalancer 的默认咖啡因缓存设置。spring.cloud.loadbalancer.cache.caffeine.spec
警告：传递您自己的 Caffeine 规范将覆盖任何其他 LoadBalancerCache 设置，包括常规 LoadBalancer 缓存配置字段，例如ttl和capacity。
默认设置包括ttl设置为35s，默认设置initialCapacity为256.

要使用 Caffeine 而不是默认缓存，请将com.github.ben-manes.caffeine:caffeine依赖项添加到类路径。CaffeineCacheManager需要添加org.springframework:spring-context-support依赖。

常见应用程序属性

Name	Default	Description
spring.cloud.compatibility-verifier.compatible-boot-versions	`2.6.x`	Default accepted versions for the Spring Boot dependency. You can set {@code x} for the patch version if you don’t want to specify a concrete value. Example: {@code 3.4.x}

spring.cloud.compatibility-verifier.enabled	`false`	Enables creation of Spring Cloud compatibility verification.

spring.cloud.config.allow-override	`true`	Flag to indicate that {@link #isOverrideSystemProperties() systemPropertiesOverride} can be used. Set to false to prevent users from changing the default accidentally. Default true.
spring.cloud.config.override-none	`false`	Flag to indicate that when {@link #setAllowOverride(boolean) allowOverride} is true, external properties should take lowest priority and should not override any existing property sources (including local config files). Default false.
spring.cloud.config.override-system-properties	`true`	Flag to indicate that the external properties should override system properties. Default true.
spring.cloud.decrypt-environment-post-processor.enabled	`true`	Enable the DecryptEnvironmentPostProcessor.
spring.cloud.discovery.client.composite-indicator.enabled	`true`	Enables discovery client composite health indicator.
spring.cloud.discovery.client.health-indicator.enabled	`true`
spring.cloud.discovery.client.health-indicator.include-description	`false`
spring.cloud.discovery.client.health-indicator.use-services-query	`true`	Whether or not the indicator should use {@link DiscoveryClient#getServices} to check its health. When set to {@code false} the indicator instead uses the lighter {@link DiscoveryClient#probe()}. This can be helpful in large deployments where the number of services returned makes the operation unnecessarily heavy.
spring.cloud.discovery.client.simple.instances
spring.cloud.discovery.client.simple.order
spring.cloud.discovery.enabled	`true`	Enables discovery client health indicators.
spring.cloud.features.enabled	`true`	Enables the features endpoint.
spring.cloud.httpclientfactories.apache.enabled	`true`	Enables creation of Apache Http Client factory beans.
spring.cloud.httpclientfactories.ok.enabled	`true`	Enables creation of OK Http Client factory beans.
spring.cloud.hypermedia.refresh.fixed-delay	`5000`
spring.cloud.hypermedia.refresh.initial-delay	`10000`
spring.cloud.inetutils.default-hostname	`localhost`	The default hostname. Used in case of errors.
spring.cloud.inetutils.default-ip-address	`127.0.0.1`	The default IP address. Used in case of errors.
spring.cloud.inetutils.ignored-interfaces		List of Java regular expressions for network interfaces that will be ignored.
spring.cloud.inetutils.preferred-networks		List of Java regular expressions for network addresses that will be preferred.
spring.cloud.inetutils.timeout-seconds	`1`	Timeout, in seconds, for calculating hostname.
spring.cloud.inetutils.use-only-site-local-interfaces	`false`	Whether to use only interfaces with site local addresses. See {@link InetAddress#isSiteLocalAddress()} for more details.
spring.cloud.loadbalancer.cache.caffeine.spec		The spec to use to create caches. See CaffeineSpec for more details on the spec format.
spring.cloud.loadbalancer.cache.capacity	`256`	Initial cache capacity expressed as int.
spring.cloud.loadbalancer.cache.enabled	`true`	Enables Spring Cloud LoadBalancer caching mechanism.
spring.cloud.loadbalancer.cache.ttl	`35s`	Time To Live - time counted from writing of the record, after which cache entries are expired, expressed as a {@link Duration}. The property {@link String} has to be in keeping with the appropriate syntax as specified in Spring Boot `StringToDurationConverter`. @see StringToDurationConverter.java
spring.cloud.loadbalancer.clients
spring.cloud.loadbalancer.configurations	`default`	Enables a predefined LoadBalancer configuration.
spring.cloud.loadbalancer.enabled	`true`	Enables Spring Cloud LoadBalancer.
spring.cloud.loadbalancer.health-check		Properties for `HealthCheckServiceInstanceListSupplier`.
spring.cloud.loadbalancer.hint		Allows setting the value of `hint` that is passed on to the LoadBalancer request and can subsequently be used in {@link ReactiveLoadBalancer} implementations.
spring.cloud.loadbalancer.hint-header-name	`X-SC-LB-Hint`	Allows setting the name of the header used for passing the hint for hint-based service instance filtering.
spring.cloud.loadbalancer.retry		Properties for Spring-Retry and Reactor Retry support in Spring Cloud LoadBalancer.
spring.cloud.loadbalancer.retry.avoid-previous-instance	`true`	Enables wrapping ServiceInstanceListSupplier beans with `RetryAwareServiceInstanceListSupplier` if Spring-Retry is in the classpath.
spring.cloud.loadbalancer.retry.enabled		Enables LoadBalancer retries.
spring.cloud.loadbalancer.service-discovery.timeout		String representation of Duration of the timeout for calls to service discovery.
spring.cloud.loadbalancer.sticky-session		Properties for LoadBalancer sticky-session.
spring.cloud.loadbalancer.x-forwarded		Enabling X-Forwarded Host and Proto Headers.
spring.cloud.loadbalancer.zone		Spring Cloud LoadBalancer zone.
spring.cloud.refresh.additional-property-sources-to-retain		Additional property sources to retain during a refresh. Typically only system property sources are retained. This property allows property sources, such as property sources created by EnvironmentPostProcessors to be retained as well.
spring.cloud.refresh.enabled	`true`	Enables autoconfiguration for the refresh scope and associated features.
spring.cloud.refresh.extra-refreshable	`true`	Additional class names for beans to post process into refresh scope.
spring.cloud.refresh.never-refreshable	`true`	Comma separated list of class names for beans to never be refreshed or rebound.
spring.cloud.service-registry.auto-registration.enabled	`true`	Whether service auto-registration is enabled. Defaults to true.
spring.cloud.service-registry.auto-registration.fail-fast	`false`	Whether startup fails if there is no AutoServiceRegistration. Defaults to false.
spring.cloud.service-registry.auto-registration.register-management	`true`	Whether to register the management as a service. Defaults to true.
spring.cloud.util.enabled	`true`	Enables creation of Spring Cloud utility beans.