Apache Tomcat 请求的资源上不存在 'Access-Control-Allow-Origin' header

Question

我收到以下 CORS 消息:

Access to XMLHttpRequest at 'http://localhost:8080/ottoautomaatitv2/webservice?postitoimipaikka=mikkeli' 
from origin 'http://localhost:4200' has been blocked by CORS policy: 
No 'Access-Control-Allow-Origin' header is present on the requested resource.

我为解决此问题所做的工作是添加一个 CORS filter ，但这并没有解决问题。

<filter>
  <filter-name>CorsFilter</filter-name>
  <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>CorsFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

我能解决这个问题的唯一方法是使用带有 --user-data-dir="C:/Chrome dev session"--disable-web-security 目标的 Google Chrome ，但这对我来说并不理想。如何在 Apache Tomcat 上启用 Access-Control-Allow-Origin？

Answer 1

我通过在 Tomcat 的 web.xml 中添加 CORS 过滤器和一些属性来修复 Angular 应用程序给出的 access-control-allow-origin header 错误。

<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>http://localhost:4200</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>