Venkatt Guhesan has been an Enterprise Java Architect with over 15 years of software development experience living and working in the Baltimore, Maryland area. Enjoys developing in Java, Scala, Groovy, Python, Ruby, Cold Fusion and Perl. Strong supporter of open source technologies including Linux and Apache Foundation. Venkatt is a DZone MVB and is not an employee of DZone and has posted 12 posts at DZone. View Full User Profile

Grails – Groovy – Alternative to HttpBuilder – adding headers to your HTTP request

10.29.2011
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Developing with Grails and Groovy can be a blessing and and pain all at the same time. The development moves at a rapid rate but when you decide to include libraries that depend on other libraries, your pain starts to build up. For example, when you include the module “HttpBuilder”in your project you may run into issues with Xerces and xml-apis, especially when you attempt to deploy the WAR file under Tomcat. These libraries are included as part of Tomcat and so an older version of those classes may give you a heartburn.

If your objective is to use some raw HTTP classes to create your requests and responses, then you can use the basic URL class to do most of the raw connection options. Although using HttpBuilder makes it a clean implementation, the URL class gives you very similar power without all the overhead of including the dependency classes.

def urlConnect = new URL(url)
def connection = urlConnect.openConnection()
//Set all of your needed headers
connection.setRequestProperty("X-Forwarded-For", "<your ip address>")

if(connection.responseCode == 200){
responseText = connection.content.text
}
else{
println "An error occurred:"
println connection.responseCode
println connection.responseMessage
}

So the trick to the Groovy URL class is to use the “openConnection()” method and then gain access to some of the raw functionality.

Cheers.

 

From http://mythinkpond.wordpress.com/2011/10/24/grails-groovy-alternative-to-httpbuilder-adding-headers-to-your-http-request/

Published at DZone with permission of Venkatt Guhesan, author and DZone MVB.

(Note: Opinions expressed in this article and its replies are the opinions of their respective authors and not those of DZone, Inc.)

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Marc-Daniel Ortega replied on Sun, 2011/10/30 - 6:20am

Thanks Pal. Pictures nicely the YAGNI principle :)

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