标记<a> change url and lost the port

Question

• In my code <a href="x.x.x.x:12345/test">myweb</a>. When click it,the url change x.x.x.x/test on the browser .The port lost.
• My browser is chrome.I try <a href="x.x.x.x:12345/test" target="_blank">myweb</a> ,the new Tab's url has port.But after loading ,it lost the port.