Why request.getRemoteAddr() returns ipv4 or ipv6 depending on context (post query or ajax query)

java spring jakarta-ee ipv6 ipv4
Jerome Cance picture Jerome Cance · Jun 25, 2010 · Viewed 34.4k times · Source

I've donne a web app with Spring/GWT that uses Flash to upload files.

When I send an ajax request with GWT and try to get the user ip address, I get an ipv4 address like: 127.0.0.1

but when I upload my files with flash (and so a post request on the same webapp) I get an ipv6 address 0:0:0:0:0:0:0:1

I use the same code to get the user ip which is: 

ServletRequestAttributes att = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();
att.getRequest().getRemoteAddr();

The problem is that I use a signature which uses the ip address to be sure that user can upload files (due to bug with session lost when uploading with flash) and the ip address changes when I use ajax or Post via flash.

What's the problem and how can I get the same ip format ?

thanks

Answer

Ted Bigham picture Ted Bigham · Feb 21, 2014

You can fix it by starting your server with this flag

-Djava.net.preferIPv4Stack=true

Related questions

Spring Web Service Client Tutorial or Example Required

I need to jump into the Spring Web Service Project, in that I required to implement the Spring Web Service's Client Only.. So, I have already gone through with Spring's Client Reference Document. So, I got the idea of required …

Read More
How to avoid using ApplicationContext.getBean() when implementing Spring IOC

I'm just getting started with Spring IOC concept. I often see most of the examples found in the internet use the code to get the object. ApplicationContext appContext = new ClassPathXmlApplicationContext("applicationContext.xml"); Hello hello = (Hello) appContext.getBean("hello"); As a …

Read More
Java EE 6 vs. Spring 3 stack

I'm starting a new project now. I have to choose technologies. I need something light, so no EJB or Seam. On the other hand I need JPA (Hibernate or alternative) and JSF with IceFaces. Do you think that such a …

Read More