Table of Contents Show 1 What is the HTTP 501 Not Implemented Error? 1.1 Variations of the 501 Not Implemented Error 1.2 501 vs. 405 Error 2 How to fix the HTTP 501 Not Implemented Error 2.1 Reload the page 2.2 Clear your browser cache 2.3 Disable proxy settings 2.4 Scan your computer for viruses … Continue reading How to Fix a HTTP 501 Not Implemented Error