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From "Lukasz Lenart (JIRA)" <>
Subject [jira] [Resolved] (WW-4024) Support expressions for scheme attribute in s:url
Date Mon, 25 Aug 2014 19:36:59 GMT


Lukasz Lenart resolved WW-4024.

    Resolution: Fixed
      Assignee: Lukasz Lenart

Done, thanks for the patch!

> Support expressions for scheme attribute in s:url
> -------------------------------------------------
>                 Key: WW-4024
>                 URL:
>             Project: Struts 2
>          Issue Type: Improvement
>          Components: Plugin - Tags
>    Affects Versions: 2.3.8
>            Reporter: Octavi Ripolles-Querol
>            Assignee: Lukasz Lenart
>            Priority: Minor
>             Fix For: 2.3.18
>         Attachments:,, WW-3999-v1-url-tag.patch
> I open this issue as of Lukasz Lenart's comment on this Stack Overflow question:
. I think it would be nice to support expressions at "scheme" attribute in "s:url" tag. The
situation I faced is as follows:
> I'm developing a secure web application. This application runs on an application server
behind a load balancer. The load balancer receives HTTPS traffic from the internet but forwards
requests to the application server with HTTP. Responses are sent back from the application
server to the load balancer with HTTP and then the load balancer forwards them to the internet
with HTTPS. The sysadmins disabled the HTTPS support in the application servers because of
performance reasons, so when we developers need to directly access a particular server (e.g.
for troubleshooting) we need to use HTTP.
> So we have a scenario where the same application, from the point of view of the final
user, is accessed both by HTTP and HTTPS, but the application itself only receives HTTP traffic.
Struts2, when rendering a s:url tag, by default chooses the scheme used by the request. In
this case, always HTTP, which is wrong from the point of view of the final users who access
the application through the load balancer. 
> A work-around to this situation would be to support expressions in the scheme attribute
of s:url, so with the following code:
> {code:xml}
> <s:url scheme="%{myScheme}" id="myUrl" action="MyAction" includeParams="none">
>    <s:param name="someParam" value="blah"/>
> </s:url>
> <s:a href="%{myUrl}">click me</s:a>
> {code}
> Struts would render either
> {code:xml}
> <a href="">click me</a>
> {code}
> or
> {code:xml}
> <a href="">click me</a>
> {code}
> instead of the current output:
> {code:xml}
> <a href="%{myScheme}://">click
> {code}
> In my case, I've overcome this situation by using a custom implementation of UrlRenderer,
actually a near copy-paste of ServletUrlRenderer, with the only change being the line where
Struts2 sets the default value for the scheme attribute. I've set this default value to my
convenience, using a value from the Value Stack.
> Thanks for taking this into consideration!

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