While you are developing a grails app, by default you are using an embedded Tomcat instance.

Sometimes you’ll need to do some configuration, in my case I had to proxy my tomcat instance with an Apache web server through mod_proxy_ajp .

When you have a standalone server running, you can easily change your server.xml file to add an AJP conector which listens for the Apache connections.

To do this within your grails app simply create a _Events.groovy file in your scripts folder of the grails project, and add the configurations needed by your app to the tomcat instance.

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import grails.util.GrailsUtil
import org.apache.catalina.connector.Connector
import org.apache.coyote.http11.Http11AprProtocol
 
eventConfigureTomcat = {tomcat ->
if (GrailsUtil.environment == 'development')
{
def ajpConnector = new Connector("org.apache.coyote.ajp.AjpProtocol")
ajpConnector.port = 8009
ajpConnector.protocol = "AJP/1.3"
ajpConnector.redirectPort = 8443
ajpConnector.enableLookups = false
ajpConnector.setProperty("redirectPort", "8443")
ajpConnector.setProperty("protocol", "AJP/1.3")
ajpConnector.setProperty("enableLookups", "false")
tomcat.service.addConnector ajpConnector
println "Configured Tomcat ajp connector on port 8009"
}
}

You can also add other tomcat configuration such as Tomcat users and roles: link

While developing a utility script to monitor my mobile data consumed, I found a problem with

the response I was getting from the server. It content-type was set to ‘text/json’ instead of ‘application/json’, ‘application/javascript’ or ‘text/javascript’ wich are the content types used by HTTPBuilder to parse a response as JSON.

To solve this problem, one must add a new content type to the ParserRegistry and parse the response.

There are two ways to do it:

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def httpBuilder = new HTTPBuilder(baseUrl)
 
httpBuilder.parser.'text/json' = { resp ->
   def bufferedText = resp.entity.content.getText( ParserRegistry.getCharset( resp ) ).trim()
   return new JsonSlurper().parseText( bufferedText )
}

The second ( reuse default )

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def httpBuilder = new HTTPBuilder(baseUrl)
httpBuilder.parser.'text/json' = httpBuilder.parser.'application/json'

Now everything works again.

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