HTTP Integration with port number

Is it possible to specify a port number with an HTTP integration in the app server? In particular, my POST endpoint must be:

http://91.xxx.xxx.xxx:1880/page.html

But I am receiving the following error:

 lora-app-server[18499]: time="2018-10-04T23:20:34Z" level=error msg="handler *httphandler.Handler error: new request error: parse  http://91.xxx.xxx.xxx:1880/page.html?type=join: first path segment in URL cannot contain colon"