public String getParameter(String name) {
        return getRequestDetails().getParameter(name);
    }
Returns the value of the HTTP parameter having the given name from the
original details of the HTTP request that is related to these
credentials. Parameter names are case-sensitive. If no such parameter was
present, null is returned. If the parameter had multiple values, the
first value is returned.
<p>
For access to all values of a parameter, as well as other details of the
request, see {@link #getRequestDetails()}. This is a convenience
function that is equivalent to invoking {@link RequestDetails#getParameter(java.lang.String)}.

@param name
    The name of the parameter to retrieve. This name is case-sensitive.

@return
    The first value of the HTTP parameter with the given name, or null
    if there is no such parameter.
guacamole-ext/src/main/java/org/apache/guacamole/net/auth/Credentials.java