Apache Camel - Proxy route

In this example I will configure a Camel route proxy. Camel will publish a http servlet and redirect all request to a external provider.

Configuration

You need to configure as follow:

• Configure dependencies
• Configure Camel servlet
• Configure Camel route

Configure dependencies

In pom.xml:

<dependency>
 <groupId>org.apache.camel</groupId>
 <artifactId>camel-servlet</artifactId>
 <version>${camel.version}</version> 
</dependency>

<dependency>
 <groupId>org.apache.camel</groupId>
 <artifactId>camel-http4</artifactId>
 <version>${camel.version}</version> 
</dependency>

Configure Camel servlet

In web.xml:

<servlet>
 <servlet-name>CamelServlet</servlet-name>
 <display-name>Camel Http Transport Servlet</display-name>
 <servlet-class>org.apache.camel.component.servlet.CamelHttpTransportServlet</servlet-class>
</servlet>

<servlet-mapping>
 <servlet-name>CamelServlet</servlet-name>
 <url-pattern>/services/*</url-pattern>
</servlet-mapping>

Or, alternatively, in java:

import javax.servlet.annotation.WebServlet;

@WebServlet(name = "CamelServlet", urlPatterns = { "/services/*" }, loadOnStartup = 1)
public class CamelRestServlet extends org.apache.camel.component.servlet.CamelHttpTransportServlet { 
 private static final long serialVersionUID = 2886685336873526067L;
 //Servlet secuestrado por Camel para procesar las peticiones de entrada a su ruta proxy
}

Configure Camel route

In camel-context.xml:

<camelContext id="camelContext" xmlns="http://camel.apache.org/schema/spring">
 <route>
  <from uri="servlet:/service1?matchOnUriPrefix=true"/>
  <log message="Redirecting to service1"/>
  <to uri="http4://otherDomain:8080/otherApp/service1?bridgeEndpoint=true&amp;throwExceptionOnFailure=false"/>
 </route>
 
 
 <route>
  <from uri="servlet:/service2?matchOnUriPrefix=true"/>
  <log message="Redirecting to service2"/>
  <to uri="http4://otherDomain:8080/otherApp/service2?bridgeEndpoint=true&amp;throwExceptionOnFailure=false"/>
 </route>
</camelContext>

Testing

In your app is published in http://localhost:8080/myApp, then you will get the following behaviour:

When calling http://localhost:8080/myApp/services/service1/test?a=b Camel will redirect to http://otherDomain:8080/otherApp/service1/test?a=b