java - Camel servlet 没有带 http uri 的 spring 示例 <to> 标记？

Question

我将camel-example-servlet-tomcat-no-spring示例部署到了tomcat。效果很好。我更改了camel-config.xml，但出现以下错误。

java.lang.IllegalArgumentException: Invalid uri: /camel-example/camel/hello. If you are forwarding/bridging http endpoints, then enable the bridgeEndpoint option on the endpoint: Endpoint[https://www.google.com]
    at org.apache.camel.component.http.HttpProducer.createMethod(HttpProducer.java:376)
    at org.apache.camel.component.http.HttpProducer.process(HttpProducer.java:91)
    at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61)
    at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:110)
    at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:72)
    at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:398)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
    at org.apache.camel.processor.loadbalancer.QueueLoadBalancer.process(QueueLoadBalancer.java:43)
    at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:72)
    at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:398)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
    at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:105)
    at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:87)
    at org.apache.camel.component.http.CamelServlet.service(CamelServlet.java:127)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)
    at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:617)
    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1760)
    at java.lang.Thread.run(Thread.java:662)

实际的camel-config.xml:

<routes xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="servlet:///hello"/>
    <choice>
      <when>
        <header>name</header>
        <transform>
          <simple>Hello ${header.name} how are you?</simple>
        </transform>
      </when>
      <otherwise>
        <transform>
          <constant>Add a name parameter to uri, eg ?name=foo</constant>
        </transform>
      </otherwise>
    </choice>
  </route>

</routes>

更改了camel-config.xml:

 <routes xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="servlet:///hello"/>
    <loadBalance>
    <weighted roundRobin="false" distributionRatio="1"/>
        <to uri="https://www.google.com"/>
    </loadBalance>
  </route>

</routes>

我的网址:

http://localhost:8080/camel-example/camel/hello?bridgeEndpoint=true

我添加了bridgeEndpoint=true并也删除了，我尝试了两种方法。我遇到了同样的错误。

请帮帮我

how do I configure http urls in <to> tag.

Answer 1

啊，servlet 组件使用 HTTP 端点拾取和使用的一些 HTTP 相关 header 来丰富消息。

因此，您需要做的是在路由到 http uri 之前删除这些 header 。

<from uri="servlet:///hello"/>
<removeHeaders pattern="CamelHttp*"/>
...

Camel 网站上有一个关于此问题的常见问题解答:http://camel.apache.org/how-to-remove-the-http-protocol-headers-in-the-camel-message.html