1.zuul是基於servlet 2.5，相容servlet3.0，使用的是阻塞api，不支援長連線如websocket
2.gateway基於spring5，reactor和spring boot2使用了非阻塞api，支援websocket，和spring完美整合，對開發者友好。
3.zuul2支援非阻塞api，但沒有和spring cloud整合，且已經停止維護，不在考慮之列。
看spring-cloud-gateway-core包下的 spring.factories
# auto configure
org.springframework.boot.autoconfigure.enableautoconfiguration=\
org.springframework.cloud.gateway.config.gatewayclasspathwarningautoconfiguration,\
org.springframework.cloud.gateway.config.gatewayautoconfiguration,\
org.springframework.cloud.gateway.config.gatewayloadbalancerclientautoconfiguration,\
org.springframework.cloud.gateway.config.gatewaynoloadbalancerclientautoconfiguration,\
org.springframework.cloud.gateway.config.gatewaymetricsautoconfiguration,\
org.springframework.cloud.gateway.config.gatewayredisautoconfiguration,\
org.springframework.cloud.gateway.discovery.gatewaydiscoveryclientautoconfiguration
org.springframework.boot.env.environmentpostprocessor=\
org.springframework.cloud.gateway.config.gatewayenvironmentpostprocessor
package org.springframework.cloud.gateway.config;
import org.apache.commons.logging.log;
import org.apache.commons.logging.logfactory;
import org.springframework.boot.autoconfigure.autoconfigurebefore;
import org.springframework.boot.autoconfigure.condition.conditionalonclass;
import org.springframework.boot.autoconfigure.condition.conditionalo****singclass;
import org.springframework.context.annotation.configuration;
@configuration
@autoconfigurebefore(gatewayautoconfiguration.class)
public class gatewayclasspathwarningautoconfiguration
} @configuration
@conditionalo****singclass("org.springframework.web.reactive.dispatcherhandler")
protected static class webfluxmissingfromclasspathconfiguration
}}
2.若不存在spring webflux的前端控制器org.springframework.web.reactive.dispatcherhandler，則報警,原因是需要使用非阻塞的api。
@bean
filteringwebhandler webhandler, routelocator routelocator,
globalcorsproperties globalcorsproperties, environment environment)
@override
protected mono> gethandlerinternal(serverwebexchange exchange)
return lookuproute(exchange)
.flatmap((function>) r ->
exchange.getattributes().put(gateway_route_attr, r);
return mono.just(webhandler);
}).switchifempty(mono.empty().then(mono.fromrunnable(() ->
})));
}
protected monolookuproute(serverwebexchange exchange) )
// instead of immediately stopping main flux due to error, log and
// swallow it
.doonerror(e -> logger.error(
e)).onerrorresume(e -> mono.empty()))
// .defaultifempty() put a static route not found
// or .switchifempty()
// .switchifempty(mono.empty().log("noroute"))
.next()
// todo: error handling
.map(route ->
validateroute(route, exchange);
return route;
});/*
* todo: trace logging if (logger.istraceenabled()) */}
關於route的定義
可以看出url和gatewayfilter進行了繫結
2.將route放入serverwebexchange的屬性中。
@bean
public filteringwebhandler filteringwebhandler(listglobalfilters)
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