爲所有請求添加額外的頭文件（Angular to Tomcat）

Question

我有一個Angular應用程序在端口上運行。而我的Rest服務器正在端口上運行。

我想爲所有向其他服務器發出的請求添加一個額外的頭文件。

所以，這裏是休息服務器的web.xml配置文件：

<filter> 

    <filter-name>CorsFilter</filter-name> 
    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class> 

    <!-- With or without this, it doesn't work --> 
    <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.allowed.origins</param-name> 
     <param-value>http://localhost:3000</param-value> 
    </init-param> 

    <init-param> 
     <param-name>cors.allowed.methods</param-name> 
     <param-value>GET,POST,HEAD,OPTIONS,PUT,DELETE</param-value> 
    </init-param> 

    <init-param> 
     <param-name>cors.exposed.headers</param-name> 
     <param-value>Location</param-value> 
    </init-param> 

</filter> 

當我加入這個在我interceptor.js：

config.headers["x-rest-version"] = "2.0.0"; // version dynamically generated 

服務器返回403：

# Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3000' is therefore not allowed access. The response had HTTP status code 403. 

當我刪除javascript文件中的行時，請求成功完成。

Answer 1

HTTP服務器使用來檢查HTTP標頭和您試圖通過頭x-rest-version，它不是白上列出你的配置。

將x-rest-version加到cors.allowed.headers。

... 
<init-param> 
    <param-name>cors.allowed.headers</param-name> 
    <param-value>x-rest-version,Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers</param-value> 
</init-param> 
...