如何在Apache Camel中设置Cache-Control标头

Question

我使用的是Apache camel 2.15.1版本。在本文中，我将servlet组件用于rest dsl。我的简单路线如下所示

from（rest:get:CustomerDetails.json）。到（”http://localhost:8080/customer/getCustomerDetails?bridgeEndpoint=true”；

我需要设置Cache-Control和Pragma头以进行响应。

from（rest:get:CustomerDetails.json）。到（”http://localhost:8080/customer/getCustomerDetails?bridgeEndpoint=truesetHeader（“缓存控制”，常量（“私有，最大年龄=0，无存储”）；

但是骆驼忽略了这一点。我看了几个其他人的博客，建议使用自定义的HeaderFilterStrategy。我也尝试过这个。没有帮助。

https://access.redhat.com/documentation/en-US/Red_Hat_JBoss_Fuse/6.0/html/Web_Services_and_Routing_with_Camel_CXF/files/Proxying-Headers.html

https://issues.apache.org/jira/browse/CAMEL-6085

非常感谢您为解决此问题提供的任何帮助。

Answer 1

您可以让它与自定义HeaderFilterStrategy一起工作。诀窍是在restConfiguration（）. endpoint Properties（...）中配置它，如下所示：

public void configure() {
    JndiRegistry registry = getContext().getRegistry(JndiRegistry.class);
    registry.bind("filter", new HeaderFilter());

    restConfiguration()
    .host("localhost")
    .endpointProperty("headerFilterStrategy","#filter")
    .setPort("10000");

    from("rest:get:hello")
    .to("http://localhost:20000?bridgeEndpoint=true")
    .setHeader("Cache-Control",constant("private, max-age=0,no-store"));

    from("netty-http:http://localhost:20000")
    .setBody(constant("ok"));
}

其中#filter只是像这样的虚拟实现（您可以创建一个更适合您需求的过滤器）

public class HeaderFilter implements HeaderFilterStrategy {

    @Override
    public boolean applyFilterToCamelHeaders(String arg0, Object arg1, Exchange arg2) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean applyFilterToExternalHeaders(String arg0, Object arg1, Exchange arg2) {
        // TODO Auto-generated method stub
        return false;
    }

}

现在，如果我不走我的路线。endpointProperty（“headerFilterStrategy”，“#filter”）行我得到如下输出

$ curl -D - http://localhost:10000/hello
HTTP/1.1 200 OK
Accept: */*
breadcrumbId: ID-myhost-40508-1441899753215-0-1
User-Agent: curl/7.35.0
Content-Length: 2
Connection: keep-alive

ok

并且使用. endpoint Property（“HeaderFilterStrategy”、“#filter”）行输出，如下所示

$ curl -D - http://localhost:10000/hello
HTTP/1.1 200 OK
Accept: */*
breadcrumbId: ID-myhost-56308-1441899833287-0-1
Cache-Control: private, max-age=0,no-store
CamelHttpMethod: GET
CamelHttpResponseCode: 200
CamelHttpUri: /hello
CamelHttpUrl: http://localhost:10000/hello
CamelNettyChannelHandlerContext: org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext@1fac34b
CamelNettyLocalAddress: /127.0.0.1:10000
CamelNettyMessageEvent: [id: 0x93dfe147, /127.0.0.1:35302 => /127.0.0.1:10000] RECEIVED: DefaultHttpRequest(chunked: false) GET /hello HTTP/1.1 User-Agent: curl/7.35.0 Host: localhost:10000 Accept: */*
CamelNettyRemoteAddress: /127.0.0.1:35302
User-Agent: curl/7.35.0
Content-Length: 2
Connection: keep-alive

ok