Spring Integration - url-variable not working in http:outbound-gateway

[jasper2000]

In order to send http request to dynamic urls based on message headers...

I am trying to set the url value from Message header as follows:

<int-http:outbound-gateway id="httpOutboundGateway" request-channel="fromMyQueue"
url="{outboundGatewayUrl}" reply-channel="nullChannel"
http-method="POST" expected-response-type="java.lang.String" charset="UTF-8">
<int-http:uri-variable name="outboundGatewayUrl" expression="headers['X-CUSTOM-HTTP-REQUEST-URL']" />

But this is not working.
Apparently {outboundGatewayUrl} value is not being replaced i.e evaluated at all Or is my understanding of the issue not right?
This works if i replace the {outboundGatewayUrl} with actual URL.

Error Message:
Caused by:
org.springframework.integration.MessageHandlingExc eption: HTTP request execution failed for URI [{outboundGatewayUrl}]...

Caused by:<br> java.lang.IllegalArgumentException: URI is not absolute
at java.net.URI.toURL(URI.java:1080)
at org.springframework.http.client.SimpleClientHttpRe questFactory.createRequest(SimpleClientHttpRequest Factory.java:109)

What am i missing here?

[oleg.zhurakousky]

You should use 'url-expression' attribute instead of 'url'
See https://jira.springsource.org/browse/INT-2570

[Gary Russell]

Bear in mind that's only available in 2.2.

As I pointed out in the Stack Overflow question, the URI is not absolute error is produced if your uri variable expression resolves to null (e.g. if the header doesn't exist).

[Gary Russell]

Just one other point - if your URL contains special characters (e.g. ?), it won't work properly and you have to use the technique that Oleg cited.

http://stackoverflow.com/questions/1...tbound-gateway