Octavi Ripolles-Querol created WW-4024:
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Summary: Support expressions for scheme attribute in s:url
Key: WW-4024
URL: https://issues.apache.org/jira/browse/WW-4024
Project: Struts 2
Issue Type: Improvement
Components: Plugin - Tags
Affects Versions: 2.3.8
Reporter: Octavi Ripolles-Querol
Priority: Minor
I open this issue as of Lukasz Lenart's comment on this Stack Overflow
question: http://stackoverflow.com/q/15569532/837154 . 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:
<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>
Struts would render either
<a href="https://myhost.com/mywebapp/MyAction.action?someParam=blah";>click
me</a>
or
<a href="http://myhost.com/mywebapp/MyAction.action?someParam=blah";>click me</a>
instead of the current output:
<a
href="%{myScheme}://myhost.com/mywebapp/MyAction.action?someParam=blah">click
me</a>
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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