我正在构建一个使用 REST API 与 Camunda 进程交互的 Angular 4 应用程序。尝试登录,面临 CORS 错误。
Dockerfile:
FROM camunda/camunda-bpm-platform:tomcat-latest
ADD sample.war /camunda/webapps/sample.war
COPY ./web.xml /camunda/webapps/engine-rest/WEB-INF
像这样运行它:
docker build -t camunda-eval .
docker run -d --name camunda -p 8080:8080 <image>
控制台中的错误:
加载失败 http://localhost:8080/camunda/api/admin/auth/user/default/login/tasklist: 请求的上不存在"访问控制允许源"标头 资源。因此不允许使用原产地"http://localhost:4200" 访问。
我的网站.xml看起来像这样:
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<filter>
<filter-name>EmptyBodyFilter</filter-name>
<filter-class>org.camunda.bpm.engine.rest.filter.EmptyBodyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>EmptyBodyFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>CacheControlFilter</filter-name>
<filter-class>org.camunda.bpm.engine.rest.filter.CacheControlFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CacheControlFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Http Basic Authentication Filter -->
<!-- <filter>
<filter-name>camunda-auth</filter-name>
<filter-class>
org.camunda.bpm.engine.rest.security.auth.ProcessEngineAuthenticationFilter
</filter-class>
<init-param>
<param-name>authentication-provider</param-name>
<param-value>org.camunda.bpm.engine.rest.security.auth.impl.HttpBasicAuthenticationProvider</param-value>
</init-param>
<init-param>
<param-name>rest-url-pattern-prefix</param-name>
<param-value></param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>camunda-auth</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> -->
<filter>
<filter-name>Resteasy</filter-name>
<filter-class>
org.jboss.resteasy.plugins.server.servlet.FilterDispatcher
</filter-class>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>org.camunda.bpm.engine.rest.impl.application.DefaultApplication</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Resteasy</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>CorsFilter</filter-name>
<filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
<init-param>
<param-name>cors.allowed.origins</param-name>
<param-value>*</param-value>
</init-param>
<init-param>
<param-name>cors.allowed.methods</param-name>
<param-value>GET,POST,HEAD,OPTIONS,PUT</param-value>
</init-param>
<init-param>
<param-name>cors.allowed.headers</param-name>
<param-value>Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers</param-value>
</init-param>
<init-param>
<param-name>cors.exposed.headers</param-name>
<param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials</param-value>
</init-param>
<init-param>
<param-name>cors.support.credentials</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>cors.preflight.maxage</param-name>
<param-value>10</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CorsFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
关于如何解决这个问题的任何想法?
您收到此错误是因为"localhost:4200"和"localhost:8080"在 CORS 方面不是同一台机器。
通常,您有 3 种方法可以避免这种情况:
- 只需告诉您的浏览器忽略 CORS(例如
chromium-browser --disable-web-security --user-data-dir
) - 如果您只想玩一玩,这是最快的,但当然没有生产解决方案 - 在 8080 上设置 CORS 标头以允许从 4200 ...此处不适用(很容易,因为您不控制Camunda应用程序)
- 使用通过反向代理在内部重新路由请求的"边缘"(或"网关")服务器。意思是:您的浏览器仅与网关(假设端口 80)通信,这会将请求路由到您的任务列表 (4200) 或 camunda (8080)。这是解决此问题的标准方法,如果您寻找nginx或zuul,您将找到很好的文档。但是,它将需要一个额外的服务组件。