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https://issues.apache.org/jira/browse/WW-4628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15515428#comment-15515428
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Lukasz Lenart edited comment on WW-4628 at 9/23/16 5:13 AM:
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Now when I want to define two params in {{<s:url/>}} tag, the {{&}} is replaced 
with {{& amp;}} which is invalid :/

{code:xml}
<s:url action="url">
    <s:param name="param1" value="1"/>
    <s:param name="param2" value="2"/>
</s:url>
{code}

will produce
{noformat}
/url?param1=1&amp;param2=2
{noformat}


was (Author: lukaszlenart):
Now when I want to define two params in {{<s:url/>}} tag, the {{&}} is replaced 
with {{&amp;}} which is invalid :/

{code:xml}
<s:url action="url">
    <s:param name="param1" value="1"/>
    <s:param name="param2" value="2"/>
</s:url>
{code}

will produce
{noformat}
/url?param1=1&amp;param2=2
{noformat}

> Space character and includeParams
> ---------------------------------
>
>                 Key: WW-4628
>                 URL: https://issues.apache.org/jira/browse/WW-4628
>             Project: Struts 2
>          Issue Type: Bug
>    Affects Versions: 2.3.28
>            Reporter: Pierre-Yves Soblet
>            Assignee: Christoph Nenning
>             Fix For: 2.3.31, 2.5.3
>
>         Attachments: Struts2UrlTest.zip
>
>
> With this JSP snippet using Struts 2 taglib:
> {code}
> myParameter=[<s:property value="%{#parameters['myParameter']}"/>]
> <br/>
> <s:url action="url" includeParams="get"/>
> <br/>
> <s:url action="url">
>     <s:param name="myParameter" value="%{#parameters['myParameter']}"/>
> </s:url>
> {code}
> When the action is called with a parameter containing a space (which is 
> escaped in the URL) :
> {code}
> localhost:8080/url?myParameter=with+space
> {code}
> The output is as follows :
> {code}
> myParameter=[with space]
> /url.action?myParameter=with%2Bspace
> /url.action?myParameter=with+space    
> {code}
> The *includeParams* attribute of the “url” tag seems to transform the "space" 
> character into the "plus" character (both in their url-encoded forms).



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