The port test uses Ajax, and Ajax can't work if the debug messages are being sent in the HTTP response.. the browser just ends up seeing 'noise' -- exactly what you see -- and can't find the port test response.
The same thing happens with the Request from Google link. Postman writes a Location header, but the debug output prematurely truncates the header calls. The browser can't interpret the redirect instruction.
You need to disable printing your debug output to your HTML. Did you check your php.ini file? Look for option 'display_errors' and make sure it is set to off.
I could possibly send you a patched Postman that with all the debug turned off, but there is a greater security issue here. Imagine a plugin dumped something sensitive like a password into the debug log and it ended up on Google as it crawled the site.
