Java Servlet getParameter for a param that is a URL

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I am building a site which submits a url to a servlet for analysis purposes. On the client side, I submit the url as a parameter that is encoded. For example...


                      
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                  一整个雨季        
                
              
                            
                2021-02-08 11:10
              
            
            
                                                                       
I can't reproduce your problem on Tomcat 6.0.29. There's more at matter. Maybe a Filter in the chain which is doing something with the request object?
Anyway, here's a SSCCE in flavor of a single JSP:
<!DOCTYPE html>
<html lang="en">
    <head>
        <title>Test</title>
    </head>
    <body>
        <p><a href="?url=http%3A%2F%2Fwww.site.com%3Fparam1%3D1%26param2%3D2">click here</a>
        <p>URL: ${param.url}
    </body>
</html>

Copy'n'paste'n'run it and click the link. Right here I see the following result:

click here
URL: http://www.site.com?param1=1&param2=2

The same is reproducible with a simple servlet like this which is invoked directly by browser address bar:
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.getWriter().write(request.getParameter("url"));
}

Tomcat is by the way configured with URIEncoding="UTF-8" in HTTP connector, but even with ISO-8859-1 (which is the default), the behaviour is -as expected in this particular case- the same.
                                                                        
                                                        
            
            
              
                
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