Connection error, no response from the server: rel="https://api.w.org/"

Hi there! I’m trying to clean up my website. When I run speed test utilities, I get an error on a particular file request. It shows “Connection error, no response from the server“
Does anyone know how I can fix this?

Website URL: https://www.mauricephillips.me

Speed test results: https://tools.pingdom.com/cSHeKR/https://mauricephillips.me

The link to the file that has the error is:
<https://www.mauricephillips.me/wp-json/>; rel="https://api.w.org/"

Pragma: no-cache
Date: Wed, 20 Jul 2016 18:29:25 GMT
Content-Encoding: gzip
Vary: Accept-Encoding,User-Agent
Server: Apache
X-Powered-By: W3 Total Cache/0.9.4.1
Strict-Transport-Security: max-age=31536000
Content-Type: text/html; charset=UTF-8
Cache-Controlno-cache, must-revalidate, max-age=0
Connection: Keep-Alive
Link: <https://www.mauricephillips.me/wp-json/>; rel="https://api.w.org/"
Content-Length: 7119Keep-Alivetimeout=10, max=100
Expires: Wed, 11 Jan 1984 05:00:00 GMT