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# 常见问题
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## 在SpringCloudGateway中获取请求参数
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```java
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ApiParam apiParam = ServerWebExchangeUtil.getApiParam(exchange);
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```
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## 微服务端如何获取appId等参数
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```java
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String app_id = request.getParameter("app_id");
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```
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## 如何关闭签名验证
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- 针对某一个接口关闭签名验证
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`@Open(value = "alipay.story.get", ignoreValidate = true)`
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## 注册到eureka显示hostname,非ip
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```properties
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eureka.instance.prefer-ip-address=true
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eureka.instance.instance-id=${spring.cloud.client.ip-address}:${server.port}
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```
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```xml
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-commons</artifactId>
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</dependency>
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```
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参考:https://www.jianshu.com/p/5ad8317961b7
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## 直接访问服务的swagger-ui.html ,提示access forbidden
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找到微服务的`OpenServiceConfig.java`,重写内部类Swagger2中的swaggerAccessProtected()方法,返回false。线上请设置成true
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```java
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// 开启文档
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@Configuration
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@EnableSwagger2
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public static class Swagger2 extends SwaggerSupport {
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@Override
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protected String getDocTitle() {
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return "故事API";
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}
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@Override
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protected boolean swaggerAccessProtected() {
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return false;
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}
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}
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```
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## 调试网关出现服务不可用
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打断点调试,网关出现Read Timeout
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参考:https://blog.csdn.net/qq_36872046/article/details/81058045
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yml添加:
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```properties
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# https://blog.csdn.net/qq_36872046/article/details/81058045
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# 路由转发超时时间,毫秒,默认值1000,详见:RibbonClientConfiguration.DEFAULT_READ_TIMEOUT。
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# 如果微服务端 处理时间过长,会导致ribbon read超时,解决办法将这个值调大一点
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ribbon.ReadTimeout= 60000
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```
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## 其它微服务没有开放接口,需要排除
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在sop-gateway项目中配置
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```properties
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# 排除服务,多个用,隔开
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sop.service.exclude=your-serviceId1,your-serviceId2
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```
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或者使用正则:
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```properties
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# 排除以"test-"开头的
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# 多个正则用英文分号(;)隔开
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sop.service.exclude-regex=test\\-.*
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```
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## ISV公私钥 & 平台公私钥
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```java
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ISV私钥(必须):ISV保存,用来生成签名 --> ISV公钥(必须):平台保存,用来校验签名是否正确
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平台私钥(非必须):平台保存,对返回结果生成签名 --> 平台公钥(非必须):ISV保存,用来校验签名是否正确
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```
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总结:私钥负责加密生成签名,公钥负责校验签名是否正确
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