public String getHeader(String name) {
        return getFirstValue(headers, name);
    }
Returns the value of the HTTP header having the given name. Header names
are case-insensitive. If no such header was present, null is returned. If
the header had multiple values, the first value is returned.

@param name
    The name of the header to retrieve. This name is case-insensitive.

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