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https://issues.apache.org/jira/browse/WW-5310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17727123#comment-17727123
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nikos dimitrakas commented on WW-5310:
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Here is an example of a url with a complex fragment:
[http://www.google.se/books?hl=en&lr=&id=UxyXBQAAQBAJ&oi=fnd&pg=PA98&ots=pOt6UqtxNW&sig=oodVicap-mmch-iZpYQIfF3TGwY&redir_esc=y#v=twopage&q&f=false]
And an alternative with the fragment identifier containing escaped characters:
[https://books.google.se/books?hl=en&lr&id=UxyXBQAAQBAJ&oi=fnd&pg=PA98&ots=pOt6UqtxNW&sig=oodVicap-mmch-iZpYQIfF3TGwY&redir_esc=y&pli=1#v=snippet&q=Deng%20%26%20Wang&f=false]
> s:url does not handle equal sign correctly
> ------------------------------------------
>
> Key: WW-5310
> URL: https://issues.apache.org/jira/browse/WW-5310
> Project: Struts 2
> Issue Type: Bug
> Components: Core Tags
> Affects Versions: 2.5.30, 6.1.2
> Reporter: nikos dimitrakas
> Priority: Major
> Fix For: 6.2.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> We discovered a strange case when a URL is passed to s:url. The URL contains
> an equal sign as part of a parameter value. Example:
> [https://www.scitepress.org/PublicationsDetail.aspx?ID=GjTu91suYQI=&t=1]
> This URL works in the browser even though the equal sign that is part of the
> value of the parameter ID has not been replaced with %3D.
> When this URL is passed to an s:url as value then the equal sign disappears.
> When I put a break point in ComponentTagSupport.doStartTag() I can see that
> the query string has been split and the component.parameters contains the two
> parameters (ID and t), but the equal sign is missing.
> The problem seems to be in ServletUrlRenderer.mergeRequestParameters called
> from beforeRenderUrl. The way the StrutsQueryStringParser.parse splits each
> param of the queryString on equal sign causes all the equal signs to be used,
> not just the first. Shouldn't that split be only on the first equal sign so
> that any remaining equal signs can be considered as part of the value? Just
> by adding a limit of one to the split should fix this.
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