Sometimes a simple change as adding a slash may improve the performance of your web-applications. Consider this: the link www.salmanq.com is slower than www.salmanq.com/ (the only difference being the trailing slash).
They will both work but the latter is faster. When this link: www.onupol.com is followed the web-server returns a 301 (Moved Permanently) pointing to www.salmanq.com/ that’s one extra round trip to and from the server per link. If you have a site that’s running without the trailing slash and you have 10K+ visitors you will certainly start to feel the consequence.