Postwoman raiase a connection error when communicate with localhost.

[CodeMokee]

Description
Console print an "net::ERR_CONNECTION_REFUSED" when I try to access my nginx welcome page on my localhost. But the interface work nomarly request by chrome or postman.

Reproduce
Steps to reproduce the behavior:

1. Start nginx service on my local env, and welcome page could be access by chrome and postman. url: http://localhost:80
   Get the welcome page:
   

2. Open the same page on the postwomen.
   request the same api by postwomen.
   

Expected behavior
the response is show correctly.

Screenshots
network on the developer tools:

Desktop (please complete the following information):

• OS: windows 10
• Browser： chrome
• Version 80.0.3987.149 (Official Build) (64-bit)

Additional context
Tips: Fisrt time I meet this issue when I debug my vert.x api by postwomen. and I found this connection error. But the service log show reciew the request. So I think the issue may raised when postwomen to process the response.

[liyasthomas]

#704 (comment)

[liuxueyiTest]

[liyasthomas]

Install browser extension. Links are in README.