Custom port does not work.

[laishulu]

Prerequisites

Please answer the following questions for yourself before submitting an issue.

• [Y] I am running the latest version
• [Y] I checked the documentation and found no answer
• [Y] I checked to make sure that this issue has not already been filed

Expected Behavior

work for chat.example.com:7777, not just chat.example.com

Current Behavior
the webpage can be loaded correctly,
but when I click create chat link,
it failed to create room link.

Failure Information
for server: chat.example.com:7777,
see error visiting: https://chat.example.com/api/chat-link
even CHAT_LINK_DOMAIN=https://chat.example.com:7777

Steps to Reproduce

click "create chat link" in the home page.

Context
nginx:7777 -> chatapp:3001